Carbon dioxide - wikipedia Carbon dioxide This is the latest accepted revision, reviewed on 30 May 2018. `` CO2 '' redirects here. For other uses, see CO2 ( disambiguation ). Carbon dioxide Names Other names Carbonic acid gas Carbonic anhydride Carbonic oxide Carbon oxide Carbon ( IV ) oxide Dry ice ( solid phase ) Identifiers CAS Number 124 - 38 - 9 3D model ( JSmol ) Interactive image Interactive image 3DMet B01131 Beilstein Reference 1900390 ChEBI CHEBI : 16526 ChEMBL ChEMBL1231871 ChemSpider 274 ECHA InfoCard 100.004. 271 EC Number 204 - 696 - 9 E number E290 ( preservatives ) Gmelin Reference 989 KEGG D00004 MeSH Carbon + dioxide PubChem CID 280 RTECS number FF6400000 UNII 142M471B3J UN number 1013 ( gas ), 1845 ( solid ) InChI InChI = 1S / CO2 / c2 - 1 - 3 Key : CURLTUGMZLYLDI - UHFFFAOYSA - N InChI = 1 / CO2 / c2 - 1 - 3 Key : CURLTUGMZLYLDI - UHFFFAOYAO SMILES O = C =O C ( = O ) = O Properties Chemical formula CO Molar mass 44.01 g mol Appearance Colorless gas Odor Low concentrations : none High concentrations : sharp ; acidic Density 1562 kg / m ( solid at 1 atm and − 78.5 ° C ) 1101 kg / m ( liquid at saturation − 37 ° C ) 1.977 kg / m ( gas at 1 atm and 0 ° C ) Melting point − 56.6 ° C ; − 69.8 ° F ; 216.6 K ( Triple point at 5.1 atm ) Sublimation conditions − 78.5 ° C ; − 109.2 ° F ; 194.7 K ( 1 atm ) Solubility in water 1.45 g / L at 25 ° C ( 77 ° F ), 100 kPa Vapor pressure 5.73 MPa ( 20 ° C ) Acidity ( pK ) 6.35, 10.33 Magnetic susceptibility ( χ ) − 20.5 10 cm / mol Refractive index ( n ) 1.00045 Viscosity 0.07 cP at − 78.5 ° C Dipole moment 0 D Structure Crystal structure trigonal Molecular shape linear Thermochemistry Specific heat capacity ( C ) 37.135 J / K mol Std molar entropy ( S ) 214 J mol K Std enthalpy of formation ( Δ H ) − 393.5 kJ mol Pharmacology ATC code V03AN02 ( WHO ) Hazards Safety data sheet See : data page Sigma - Aldrich NFPA 704 0 0 SA Lethal dose or concentration ( LD, LC ) : LC ( lowest published ) 90,000 ppm ( human, 5 min ) US health exposure limits ( NIOSH ) : PEL ( Permissible ) TWA 5000 ppm ( 9000 mg / m ) REL ( Recommended ) TWA 5000 ppm ( 9000 mg / m ) ST 30,000 ppm ( 54,000 mg / m ) IDLH ( Immediate danger ) 40,000 ppm Related compounds Other anions Carbon disulfide Carbon diselenide Carbon ditelluride Other cations Silicon dioxide Germanium dioxide Tin dioxide Lead dioxide Related carbon oxides Carbon monoxide Carbon suboxide Dicarbon monoxide Carbon trioxide Related compounds Carbonic acid Carbonyl sulfide Supplementary data page Structure and properties Refractive index ( n ), Dielectric constant ( ε ), etc. Thermodynamic data Phase behaviour solid -- liquid -- gas Spectral data UV, IR, NMR, MS Except where otherwise noted, data are given for materials in their standard state ( at 25 ° C ( 77 ° F ), 100 kPa ). verify ( what is ? ) Infobox references Carbon dioxide ( chemical formula CO ) is a colorless gas with a density about 60 % higher than that of dry air. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth 's atmosphere as a trace gas. The current concentration is about 0.04 % ( 410 ppm ) by volume, having risen from pre-industrial levels of 280 ppm. Natural sources include volcanoes, hot springs and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, ice caps, glaciers and seawater. It is present in deposits of petroleum and natural gas. Carbon dioxide is odorless at normally encountered concentrations, however, at high concentrations, it has a sharp and acidic odor. As the source of available carbon in the carbon cycle, atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth 's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena. Plants, algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water, with oxygen produced as a waste product. CO is produced by all aerobic organisms when they metabolize carbohydrates and lipids to produce energy by respiration. It is returned to water via the gills of fish and to the air via the lungs of air - breathing land animals, including humans. Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread, beer and wine making. It is produced by combustion of wood and other organic materials and fossil fuels such as coal, peat, petroleum and natural gas. It is an unwanted byproduct in many large scale oxidation processes, for example, in the production of acrylic acid ( over 5 million tons / year ). It is a versatile industrial material, used, for example, as an inert gas in welding and fire extinguishers, as a pressurizing gas in air guns and oil recovery, as a chemical feedstock and as a supercritical fluid solvent in decaffeination of coffee and supercritical drying. It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence. The frozen solid form of CO, known as dry ice is used as a refrigerant and as an abrasive in dry - ice blasting. The carbon dioxide released into the atmosphere as a result of the use of fossil fuels `` represents 99.4 % of CO emissions in 2013 ''. Carbon dioxide is the most significant long - lived greenhouse gas in Earth 's atmosphere. Since the Industrial Revolution anthropogenic emissions -- primarily from use of fossil fuels and deforestation -- have rapidly increased its concentration in the atmosphere, leading to global warming. Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid. Contents 1 Background 2 Chemical and physical properties 2.1 Structure and bonding 2.2 In aqueous solution 2.3 Chemical reactions of CO 2.4 Physical properties 3 Isolation and production 4 Applications 4.1 Precursor to chemicals 4.2 Foods 4.2. 1 Beverages 4.2. 2 Wine making 4.3 Inert gas 4.4 Fire extinguisher 4.5 Supercritical CO as solvent 4.6 Agricultural and biological applications 4.7 Medical and pharmacological uses 4.8 Oil recovery 4.9 Bio transformation into fuel 4.10 Refrigerant 4.11 Coal bed methane recovery 4.12 Minor uses 5 In Earth 's atmosphere 6 In the oceans 7 Biological role 7.1 Photosynthesis and carbon fixation 7.2 Toxicity 7.2. 1 Below 1 % 7.2. 2 Ventilation 7.3 Human physiology 7.3. 1 Content 7.3. 2 Transport in the blood 7.3. 3 Regulation of respiration 8 See also 9 References 10 Further reading 11 External links Background Crystal structure of dry ice Carbon dioxide was the first gas to be described as a discrete substance. In about 1640, the Flemish chemist Jan Baptist van Helmont observed that when he burned charcoal in a closed vessel, the mass of the resulting ash was much less than that of the original charcoal. His interpretation was that the rest of the charcoal had been transmuted into an invisible substance he termed a `` gas '' or `` wild spirit '' ( spiritus sylvestris ). The properties of carbon dioxide were further studied in the 1750s by the Scottish physician Joseph Black. He found that limestone ( calcium carbonate ) could be heated or treated with acids to yield a gas he called `` fixed air. '' He observed that the fixed air was denser than air and supported neither flame nor animal life. Black also found that when bubbled through limewater ( a saturated aqueous solution of calcium hydroxide ), it would precipitate calcium carbonate. He used this phenomenon to illustrate that carbon dioxide is produced by animal respiration and microbial fermentation. In 1772, English chemist Joseph Priestley published a paper entitled Impregnating Water with Fixed Air in which he described a process of dripping sulfuric acid ( or oil of vitriol as Priestley knew it ) on chalk in order to produce carbon dioxide, and forcing the gas to dissolve by agitating a bowl of water in contact with the gas. Carbon dioxide was first liquefied ( at elevated pressures ) in 1823 by Humphry Davy and Michael Faraday. The earliest description of solid carbon dioxide was given by Adrien - Jean - Pierre Thilorier, who in 1835 opened a pressurized container of liquid carbon dioxide, only to find that the cooling produced by the rapid evaporation of the liquid yielded a `` snow '' of solid CO. Chemical and physical properties Stretching and bending oscillations of the CO carbon dioxide molecule. Upper left : symmetric stretching. Upper right : antisymmetric stretching. Lower line : degenerate pair of bending modes. Structure and bonding See also : Molecular orbital diagram § Carbon dioxide The carbon dioxide molecule is linear and centrosymmetric. The carbon -- oxygen bond length is 116.3 pm, noticeably shorter than the bond length of a C -- O single bond and even shorter than most other C -- O multiply - bonded functional groups. Since it is centrosymmetric, the molecule has no electrical dipole. Consequently, only two vibrational bands are observed in the IR spectrum -- an antisymmetric stretching mode at 2349 cm and a degenerate pair of bending modes at 667 cm. There is also a symmetric stretching mode at 1388 cm which is only observed in the Raman spectrum. In aqueous solution See also : Carbonic acid Carbon dioxide is soluble in water, in which it reversibly forms H CO ( carbonic acid ), which is a weak acid since its ionization in water is incomplete. CO + H O ⇌ H CO The hydration equilibrium constant of carbonic acid is K h = ( H 2 C O 3 ) ( C O 2 ( a q ) ) = 1.70 × 10 − 3 ( displaystyle K_ ( mathrm ( h ) ) = ( \frac ( \rm ( ( H_ ( 2 ) CO_ ( 3 ) ) ) ) ( \rm ( ( CO_ ( 2 ) ( aq ) ) ) ) ) = 1.70 \times 10 ^ ( - 3 ) ) ( at 25 ° C ). Hence, the majority of the carbon dioxide is not converted into carbonic acid, but remains as CO molecules, not affecting the pH. The relative concentrations of CO, H CO, and the deprotonated forms HCO ( bicarbonate ) and CO ( carbonate ) depend on the pH. As shown in a Bjerrum plot, in neutral or slightly alkaline water ( pH > 6.5 ), the bicarbonate form predominates ( > 50 % ) becoming the most prevalent ( > 95 % ) at the pH of seawater. In very alkaline water ( pH > 10.4 ), the predominant ( > 50 % ) form is carbonate. The oceans, being mildly alkaline with typical pH = 8.2 -- 8.5, contain about 120 mg of bicarbonate per liter. Being diprotic, carbonic acid has two acid dissociation constants, the first one for the dissociation into the bicarbonate ( also called hydrogen carbonate ) ion ( HCO ) : H CO ⇌ HCO + H K = 6999250000000000000 ♠ 2.5 × 10 mol / L ; pK = 3.6 at 25 ° C. This is the true first acid dissociation constant, defined as K a 1 = ( H C O 3 − ) ( H + ) ( H 2 C O 3 ) ( displaystyle K_ ( a1 ) = ( \frac ( \rm ( ( HCO_ ( 3 ) ^ ( - ) ) ( H ^ ( + ) ) ) ) ( \rm ( ( H_ ( 2 ) CO_ ( 3 ) ) ) ) ) ), where the denominator includes only covalently bound H CO and does not include hydrated CO ( aq ). The much smaller and often - quoted value near 6993416000000000000 ♠ 4.16 × 10 is an apparent value calculated on the ( incorrect ) assumption that all dissolved CO is present as carbonic acid, so that K a 1 ( a p p a r e n t ) = ( H C O 3 − ) ( H + ) ( H 2 C O 3 ) + ( C O 2 ( a q ) ) ( displaystyle K_ ( mathrm ( a1 ) ) ( \rm ( ( apparent ) ) ) = ( \frac ( \rm ( ( HCO_ ( 3 ) ^ ( - ) ) ( H ^ ( + ) ) ) ) ( \rm ( ( H_ ( 2 ) CO_ ( 3 ) ) + ( CO_ ( 2 ) ( aq ) ) ) ) ) ). Since most of the dissolved CO remains as CO molecules, K ( apparent ) has a much larger denominator and a much smaller value than the true K. The bicarbonate ion is an amphoteric species that can act as an acid or as a base, depending on pH of the solution. At high pH, it dissociates significantly into the carbonate ion ( CO ) : HCO ⇌ CO + H K = 6992469000000000000 ♠ 4.69 × 10 mol / L ; pK = 10.329 In organisms carbonic acid production is catalysed by the enzyme, carbonic anhydrase. Chemical reactions of CO This section needs expansion. You can help by adding to it. ( June 2014 ) CO is a weak electrophile. Its reaction with basic water illustrates this property, in which case hydroxide is the nucleophile. Other nucleophiles react as well. For example, carbanions as provided by Grignard reagents and organolithium compounds react with CO to give carboxylates : MR + CO → RCO M where M = Li or Mg Br and R = alkyl or aryl. In metal carbon dioxide complexes, CO serves as a ligand, which can facilitate the conversion of CO to other chemicals. The reduction of CO to CO is ordinarily a difficult and slow reaction : CO + 2 e + 2H → CO + H O Photoautotrophs ( i.e. plants and cyanobacteria ) use the energy contained in sunlight to photosynthesize simple sugars from CO absorbed from the air and water : n CO + n H O → ( CH O ) + n O The redox potential for this reaction near pH 7 is about − 0.53 V versus the standard hydrogen electrode. The nickel - containing enzyme carbon monoxide dehydrogenase catalyses this process. Physical properties Further information : Carbon dioxide data Pellets of `` dry ice '', a common form of solid carbon dioxide Carbon dioxide is colorless. At low concentrations the gas is odorless however, at sufficiently - high concentrations, it has a sharp, acidic odor. At standard temperature and pressure, the density of carbon dioxide is around 1.98 kg / m, about 1.67 times that of air. Carbon dioxide has no liquid state at pressures below 5.1 standard atmospheres ( 520 kPa ). At 1 atmosphere ( near mean sea level pressure ), the gas deposits directly to a solid at temperatures below − 78.5 ° C ( − 109.3 ° F ; 194.7 K ) and the solid sublimes directly to a gas above − 78.5 ° C. In its solid state, carbon dioxide is commonly called dry ice. Pressure -- temperature phase diagram of carbon dioxide Liquid carbon dioxide forms only at pressures above 5.1 atm ; the triple point of carbon dioxide is about 5.1 bar ( 517 kPa ) at 217 K ( see phase diagram ). The critical point is 7.38 MPa at 31.1 ° C. Another form of solid carbon dioxide observed at high pressure is an amorphous glass - like solid. This form of glass, called carbonia, is produced by supercooling heated CO at extreme pressure ( 40 -- 48 GPa or about 400,000 atmospheres ) in a diamond anvil. This discovery confirmed the theory that carbon dioxide could exist in a glass state similar to other members of its elemental family, like silicon ( silica glass ) and germanium dioxide. Unlike silica and germania glasses, however, carbonia glass is not stable at normal pressures and reverts to gas when pressure is released. At temperatures and pressures above the critical point, carbon dioxide behaves as a supercritical fluid known as supercritical carbon dioxide. Isolation and production Carbon dioxide can be obtained by distillation from air, but the method is inefficient. Industrially, carbon dioxide is predominantly an unrecovered waste product, produced by several methods which may be practiced at various scales. The combustion of all carbon - based fuels, such as methane ( natural gas ), petroleum distillates ( gasoline, diesel, kerosene, propane ), coal, wood and generic organic matter produces carbon dioxide and, except in the case of pure carbon, water. As an example, the chemical reaction between methane and oxygen : CH + 2 O → CO + 2 H O It is produced by thermal decomposition of limestone, CaCO by heating ( calcining ) at about 850 ° C ( 1,560 ° F ), in the manufacture of quicklime ( calcium oxide, CaO ), a compound that has many industrial uses : CaCO → CaO + CO Iron is reduced from its oxides with coke in a blast furnace, producing pig iron and carbon dioxide : Carbon dioxide is a byproduct of the industrial production of hydrogen by steam reforming and ammonia synthesis. These processes begin with the reaction of water and natural gas ( mainly methane ). Acids liberate CO from most metal carbonates. Consequently, it may be obtained directly from natural carbon dioxide springs, where it is produced by the action of acidified water on limestone or dolomite. The reaction between hydrochloric acid and calcium carbonate ( limestone or chalk ) is shown below : CaCO + 2 HCl → CaCl + H CO The carbonic acid ( H CO ) then decomposes to water and CO : H CO → CO + H O Such reactions are accompanied by foaming or bubbling, or both, as the gas is released. They have widespread uses in industry because they can be used to neutralize waste acid streams. Carbon dioxide is a by - product of the fermentation of sugar in the brewing of beer, whisky and other alcoholic beverages and in the production of bioethanol. Yeast metabolizes sugar to produce CO and ethanol, also known as alcohol, as follows : C O → 2 CO + 2 C OH All aerobic organisms produce CO when they oxidize carbohydrates, fatty acids, and proteins. The large number of reactions involved are exceedingly complex and not described easily. Refer to ( cellular respiration, anaerobic respiration and photosynthesis ). The equation for the respiration of glucose and other monosaccharides is : C O + 6 O → 6 CO + 6 H O Anaerobic organisms decompose organic material producing methane and carbon dioxide together with traces of other compounds. Regardless of the type of organic material, the production of gases follows well defined kinetic pattern. Carbon dioxide comprises about 40 - 45 % of the gas that emanates from decomposition in landfills ( termed `` landfill gas '' ). Most of the remaining 50 - 55 % is methane. Applications Carbon dioxide is used by the food industry, the oil industry, and the chemical industry. The compound has varied commercial uses but one of its greatest use as a chemical is in the production of carbonated beverages ; it provides the sparkle in carbonated beverages such as soda water, beer and sparkling wine. Precursor to chemicals This section needs expansion. You can help by adding to it. ( July 2014 ) In the chemical industry, carbon dioxide is mainly consumed as an ingredient in the production of urea, with a smaller fraction being used to produce methanol and a range of other products, such as metal carbonates and bicarbonates. Some carboxylic acid derivatives such as sodium salicylate are prepared using CO by the Kolbe - Schmitt reaction. In addition to conventional processes using CO for chemical production, electrochemical methods are also being explored at a research level. In particular, the use of renewable energy for production of fuels from CO ( such as methanol ) is attractive as this could result in fuels that could be easily transported and used within conventional combustion technologies but have no net CO emissions. Foods Carbon dioxide bubbles in a soft drink. Carbon dioxide is a food additive used as a propellant and acidity regulator in the food industry. It is approved for usage in the EU ( listed as E number E290 ), US and Australia and New Zealand ( listed by its INS number 290 ). A candy called Pop Rocks is pressurized with carbon dioxide gas at about 4 x 10 Pa ( 40 bar, 580 psi ). When placed in the mouth, it dissolves ( just like other hard candy ) and releases the gas bubbles with an audible pop. Leavening agents cause dough to rise by producing carbon dioxide. Baker 's yeast produces carbon dioxide by fermentation of sugars within the dough, while chemical leaveners such as baking powder and baking soda release carbon dioxide when heated or if exposed to acids. Beverages Carbon dioxide is used to produce carbonated soft drinks and soda water. Traditionally, the carbonation of beer and sparkling wine came about through natural fermentation, but many manufacturers carbonate these drinks with carbon dioxide recovered from the fermentation process. In the case of bottled and kegged beer, the most common method used is carbonation with recycled carbon dioxide. With the exception of British Real Ale, draught beer is usually transferred from kegs in a cold room or cellar to dispensing taps on the bar using pressurized carbon dioxide, sometimes mixed with nitrogen. Wine making Dry ice used to preserve grapes after harvest. Carbon dioxide in the form of dry ice is often used during the cold soak phase in wine making to cool clusters of grapes quickly after picking to help prevent spontaneous fermentation by wild yeast. The main advantage of using dry ice over water ice is that it cools the grapes without adding any additional water that might decrease the sugar concentration in the grape must, and thus the alcohol concentration in the finished wine. Carbon dioxide is also used to create a hypoxic environment for carbonic maceration, the process used to produce Beaujolais wine. Carbon dioxide is sometimes used to top up wine bottles or other storage vessels such as barrels to prevent oxidation, though it has the problem that it can dissolve into the wine, making a previously still wine slightly fizzy. For this reason, other gases such as nitrogen or argon are preferred for this process by professional wine makers. Inert gas It is one of the most commonly used compressed gases for pneumatic ( pressurized gas ) systems in portable pressure tools. Carbon dioxide is also used as an atmosphere for welding, although in the welding arc, it reacts to oxidize most metals. Use in the automotive industry is common despite significant evidence that welds made in carbon dioxide are more brittle than those made in more inert atmospheres. It is used as a welding gas primarily because it is much less expensive than more inert gases such as argon or helium. When used for MIG welding, CO use is sometimes referred to as MAG welding, for Metal Active Gas, as CO can react at these high temperatures. It tends to produce a hotter puddle than truly inert atmospheres, improving the flow characteristics. Although, this may be due to atmospheric reactions occurring at the puddle site. This is usually the opposite of the desired effect when welding, as it tends to embrittle the site, but may not be a problem for general mild steel welding, where ultimate ductility is not a major concern. It is used in many consumer products that require pressurized gas because it is inexpensive and nonflammable, and because it undergoes a phase transition from gas to liquid at room temperature at an attainable pressure of approximately 60 bar ( 870 psi, 59 atm ), allowing far more carbon dioxide to fit in a given container than otherwise would. Life jackets often contain canisters of pressured carbon dioxide for quick inflation. Aluminium capsules of CO are also sold as supplies of compressed gas for air guns, paintball markers / guns, inflating bicycle tires, and for making carbonated water. Rapid vaporization of liquid carbon dioxide is used for blasting in coal mines. High concentrations of carbon dioxide can also be used to kill pests. Liquid carbon dioxide is used in supercritical drying of some food products and technological materials, in the preparation of specimens for scanning electron microscopy and in the decaffeination of coffee beans. Fire extinguisher Use of a CO fire extinguisher. Carbon dioxide can be used to extinguish flames by flooding the environment around the flame with the gas. It does not itself react to extinguish the flame, but starves the flame of oxygen by displacing it. Some fire extinguishers, especially those designed for electrical fires, contain liquid carbon dioxide under pressure. Carbon dioxide extinguishers work well on small flammable liquid and electrical fires, but not on ordinary combustible fires, because although it excludes oxygen, it does not cool the burning substances significantly and when the carbon dioxide disperses they are free to catch fire upon exposure to atmospheric oxygen. Their desirability in electrical fire stems from the fact that, unlike water or other chemical based methods, Carbon dioxide will not cause short circuits, leading to even more damage to equipment. Because it is a gas, it is also easy to dispense large amounts of the gas automatically in IT infrastructure rooms, where the fire itself might be hard to reach with more immediate methods because it is behind rack doors and inside of cases. Carbon dioxide has also been widely used as an extinguishing agent in fixed fire protection systems for local application of specific hazards and total flooding of a protected space. International Maritime Organization standards also recognize carbon dioxide systems for fire protection of ship holds and engine rooms. Carbon dioxide based fire protection systems have been linked to several deaths, because it can cause suffocation in sufficiently high concentrations. A review of CO systems identified 51 incidents between 1975 and the date of the report ( 2000 ), causing 72 deaths and 145 injuries. Supercritical CO as solvent See also : Supercritical carbon dioxide Liquid carbon dioxide is a good solvent for many lipophilic organic compounds and is used to remove caffeine from coffee. Carbon dioxide has attracted attention in the pharmaceutical and other chemical processing industries as a less toxic alternative to more traditional solvents such as organochlorides. It is used by some dry cleaners for this reason ( see green chemistry ). It is used in the preparation of some aerogels because of the properties of supercritical carbon dioxide. Agricultural and Biological applications Plants require carbon dioxide to conduct photosynthesis. The atmospheres of greenhouses may ( if of large size, must ) be enriched with additional CO to sustain and increase the rate of plant growth. At very high concentrations ( 100 times atmospheric concentration, or greater ), carbon dioxide can be toxic to animal life, so raising the concentration to 10,000 ppm ( 1 % ) or higher for several hours will eliminate pests such as whiteflies and spider mites in a greenhouse. It has been proposed that CO from power generation be bubbled into ponds to stimulate growth of algae that could then be converted into biodiesel fuel. Medical and pharmacological uses In medicine, up to 5 % carbon dioxide ( 130 times atmospheric concentration ) is added to oxygen for stimulation of breathing after apnea and to stabilize the O / CO balance in blood. Carbon dioxide can be mixed with up to 50 % oxygen, forming an inhalable gas ; this is known as Carbogen and has a variety of medical and research uses. Oil recovery Carbon dioxide is used in enhanced oil recovery where it is injected into or adjacent to producing oil wells, usually under supercritical conditions, when it becomes miscible with the oil. This approach can increase original oil recovery by reducing residual oil saturation by between 7 % to 23 % additional to primary extraction. It acts as both a pressurizing agent and, when dissolved into the underground crude oil, significantly reduces its viscosity, and changing surface chemistry enabling the oil to flow more rapidly through the reservoir to the removal well. In mature oil fields, extensive pipe networks are used to carry the carbon dioxide to the injection points. Bio transformation into fuel Main article : Carbon capture and utilization A strain of the cyanobacterium Synechococcus elongatus has been genetically engineered to produce the fuels isobutyraldehyde and isobutanol from CO using photosynthesis. Refrigerant Comparison of phase diagrams of carbon dioxide ( red ) and water ( blue ) as a log - lin chart with phase transitions points at 1 atmosphere Liquid and solid carbon dioxide are important refrigerants, especially in the food industry, where they are employed during the transportation and storage of ice cream and other frozen foods. Solid carbon dioxide is called `` dry ice '' and is used for small shipments where refrigeration equipment is not practical. Solid carbon dioxide is always below − 78.5 ° C at regular atmospheric pressure, regardless of the air temperature. Liquid carbon dioxide ( industry nomenclature R744 or R - 744 ) was used as a refrigerant prior to the discovery of R - 12 and may enjoy a renaissance due to the fact that R134a contributes to climate change more than CO does. Its physical properties are highly favorable for cooling, refrigeration, and heating purposes, having a high volumetric cooling capacity. Due to the need to operate at pressures of up to 130 bar ( 1880 psi ), CO systems require highly resistant components that have already been developed for mass production in many sectors. In automobile air conditioning, in more than 90 % of all driving conditions for latitudes higher than 50 °, R744 operates more efficiently than systems using R134a. Its environmental advantages ( GWP of 1, non-ozone depleting, non-toxic, non-flammable ) could make it the future working fluid to replace current HFCs in cars, supermarkets, and heat pump water heaters, among others. Coca - Cola has fielded CO-based beverage coolers and the U.S. Army is interested in CO refrigeration and heating technology. The global automobile industry is expected to decide on the next - generation refrigerant in car air conditioning. CO is one discussed option. ( see Sustainable automotive air conditioning ) Coal bed methane recovery In enhanced coal bed methane recovery, carbon dioxide would be pumped into the coal seam to displace methane, as opposed to current methods which primarily rely on the removal of water ( to reduce pressure ) to make the coal seam release its trapped methane. Minor uses A carbon dioxide laser. Carbon dioxide is the lasing medium in a carbon dioxide laser, which is one of the earliest type of lasers. Carbon dioxide can be used as a means of controlling the pH of swimming pools, by continuously adding gas to the water, thus keeping the pH from rising. Among the advantages of this is the avoidance of handling ( more hazardous ) acids. Similarly, it is also used in the maintaining reef aquaria, where it is commonly used in calcium reactors to temporarily lower the pH of water being passed over calcium carbonate in order to allow the calcium carbonate to dissolve into the water more freely where it is used by some corals to build their skeleton. Used as the primary coolant in the British advanced gas - cooled reactor for nuclear power generation. Carbon dioxide induction is commonly used for the euthanasia of laboratory research animals. Methods to administer CO include placing animals directly into a closed, prefilled chamber containing CO, or exposure to a gradually increasing concentration of CO. In 2013, the American Veterinary Medical Association issued new guidelines for carbon dioxide induction, stating that a displacement rate of 10 % to 30 % of the gas chamber volume per minute is optimal for the humane euthanization of small rodents. Carbon dioxide is also used in several related cleaning and surface preparation techniques. In Earth 's atmosphere Main articles : Carbon dioxide in Earth 's atmosphere and Carbon cycle The Keeling Curve of atmospheric CO concentrations measured at Mauna Loa Observatory Carbon dioxide in Earth 's atmosphere is a trace gas, currently ( early 2017 ) having a global average concentration of 404 parts per million by volume ( or 614 parts per million by mass ). Atmospheric concentrations of carbon dioxide fluctuate slightly with the seasons, falling during the Northern Hemisphere spring and summer as plants consume the gas and rising during northern autumn and winter as plants go dormant or die and decay. Concentrations also vary on a regional basis, most strongly near the ground with much smaller variations aloft. In urban areas concentrations are generally higher and indoors they can reach 10 times background levels. Yearly increase of atmospheric CO : In the 1960s, the average annual increase was 37 % of the 2000 -- 2007 average. The concentration of carbon dioxide has risen due to human activities. Combustion of fossil fuels and deforestation have caused the atmospheric concentration of carbon dioxide to increase by about 43 % since the beginning of the age of industrialization. Most carbon dioxide from human activities is released from burning coal and other fossil fuels. Other human activities, including deforestation, biomass burning, and cement production also produce carbon dioxide. Human activities emit about 29 billion tons of carbon dioxide per year, while volcanoes emit between 0.2 and 0.3 billion tons. Human activities have caused CO to increase above levels not seen in hundreds of thousands of years. Currently, about half of the carbon dioxide released from the burning of fossil fuels remains in the atmosphere and is not absorbed by vegetation and the oceans. Carbon dioxide is a greenhouse gas, absorbing and emitting infrared radiation at its two infrared - active vibrational frequencies ( see the section `` Structure and bonding '' above ). This causes carbon dioxide to warm the surface and lower atmosphere while cooling the upper atmosphere. Increases in atmospheric concentrations of CO and other long - lived greenhouse gases such as methane, nitrous oxide and ozone have correspondingly strengthened their absorption and emission of infrared radiation, causing the rise in average global temperature since the mid-20th century. Carbon dioxide is of greatest concern because it exerts a larger overall warming influence than all of these other gases combined and because it has a long atmospheric lifetime ( hundreds to thousands of years ). CO in Earth 's atmosphere if half of global - warming emissions are not absorbed. ( NASA computer simulation ). Not only do increasing carbon dioxide concentrations lead to increases in global surface temperature, but increasing global temperatures also cause increasing concentrations of carbon dioxide. This produces a positive feedback for changes induced by other processes such as orbital cycles. Five hundred million years ago the carbon dioxide concentration was 20 times greater than today, decreasing to 4 -- 5 times during the Jurassic period and then slowly declining with a particularly swift reduction occurring 49 million years ago. Local concentrations of carbon dioxide can reach high values near strong sources, especially those that are isolated by surrounding terrain. At the Bossoleto hot spring near Rapolano Terme in Tuscany, Italy, situated in a bowl - shaped depression about 100 m ( 330 ft ) in diameter, concentrations of CO rise to above 75 % overnight, sufficient to kill insects and small animals. After sunrise the gas is dispersed by convection. High concentrations of CO produced by disturbance of deep lake water saturated with CO are thought to have caused 37 fatalities at Lake Monoun, Cameroon in 1984 and 1700 casualties at Lake Nyos, Cameroon in 1986. In the oceans Main article : Carbon cycle Pterapod shell dissolved in seawater adjusted to an ocean chemistry projected for the year 2100. Carbon dioxide dissolves in the ocean to form carbonic acid ( H CO ), bicarbonate ( HCO ) and carbonate ( CO ). There is about fifty times as much carbon dissolved in the oceans as exists in the atmosphere. The oceans act as an enormous carbon sink, and have taken up about a third of CO emitted by human activity. As the concentration of carbon dioxide increases in the atmosphere, the increased uptake of carbon dioxide into the oceans is causing a measurable decrease in the pH of the oceans, which is referred to as ocean acidification. This reduction in pH affects biological systems in the oceans, primarily oceanic calcifying organisms. These effects span the food chain from autotrophs to heterotrophs and include organisms such as coccolithophores, corals, foraminifera, echinoderms, crustaceans and mollusks. Under normal conditions, calcium carbonate is stable in surface waters since the carbonate ion is at supersaturating concentrations. However, as ocean pH falls, so does the concentration of this ion, and when carbonate becomes undersaturated, structures made of calcium carbonate are vulnerable to dissolution. Corals, coccolithophore algae, coralline algae, foraminifera, shellfish and pteropods experience reduced calcification or enhanced dissolution when exposed to elevated CO. Gas solubility decreases as the temperature of water increases ( except when both pressure exceeds 300 bar and temperature exceeds 393 K, only found near deep geothermal vents ) and therefore the rate of uptake from the atmosphere decreases as ocean temperatures rise. Most of the CO taken up by the ocean, which is about 30 % of the total released into the atmosphere, forms carbonic acid in equilibrium with bicarbonate. Some of these chemical species are consumed by photosynthetic organisms that remove carbon from the cycle. Increased CO in the atmosphere has led to decreasing alkalinity of seawater, and there is concern that this may adversely affect organisms living in the water. In particular, with decreasing alkalinity, the availability of carbonates for forming shells decreases, although there 's evidence of increased shell production by certain species under increased CO content. NOAA states in their May 2008 `` State of the science fact sheet for ocean acidification '' that : `` The oceans have absorbed about 50 % of the carbon dioxide ( CO ) released from the burning of fossil fuels, resulting in chemical reactions that lower ocean pH. This has caused an increase in hydrogen ion ( acidity ) of about 30 % since the start of the industrial age through a process known as `` ocean acidification. '' A growing number of studies have demonstrated adverse impacts on marine organisms, including : The rate at which reef - building corals produce their skeletons decreases, while production of numerous varieties of jellyfish increases. The ability of marine algae and free - swimming zooplankton to maintain protective shells is reduced. The survival of larval marine species, including commercial fish and shellfish, is reduced. '' Also, the Intergovernmental Panel on Climate Change ( IPCC ) writes in their Climate Change 2007 : Synthesis Report : `` The uptake of anthropogenic carbon since 1750 has led to the ocean becoming more acidic with an average decrease in pH of 0.1 units. Increasing atmospheric CO concentrations lead to further acidification... While the effects of observed ocean acidification on the marine biosphere are as yet undocumented, the progressive acidification of oceans is expected to have negative impacts on marine shell - forming organisms ( e.g. corals ) and their dependent species. '' Some marine calcifying organisms ( including coral reefs ) have been singled out by major research agencies, including NOAA, OSPAR commission, NANOOS and the IPCC, because their most current research shows that ocean acidification should be expected to impact them negatively. Carbon dioxide is also introduced into the oceans through hydrothermal vents. The Champagne hydrothermal vent, found at the Northwest Eifuku volcano in the Marianas Trench, produces almost pure liquid carbon dioxide, one of only two known sites in the world as of 2004, the other being in the Okinawa Trough. The finding of a submarine lake of liquid carbon dioxide in the Okinawa Trough was reported in 2006. Biological role Carbon dioxide is an end product of cellular respiration in organisms that obtain energy by breaking down sugars, fats and amino acids with oxygen as part of their metabolism. This includes all plants, algae and animals and aerobic fungi and bacteria. In vertebrates, the carbon dioxide travels in the blood from the body 's tissues to the skin ( e.g., amphibians ) or the gills ( e.g., fish ), from where it dissolves in the water, or to the lungs from where it is exhaled. During active photosynthesis, plants can absorb more carbon dioxide from the atmosphere than they release in respiration. Photosynthesis and carbon fixation Overview of photosynthesis and respiration. Carbon dioxide ( at right ), together with water, form oxygen and organic compounds ( at left ) by photosynthesis, which can be respired to water and ( CO ). Overview of the Calvin cycle and carbon fixation Carbon fixation is a biochemical process by which atmospheric carbon dioxide is incorporated by plants, algae and ( cyanobacteria ) into energy - rich organic molecules such as glucose, thus creating their own food by photosynthesis. Photosynthesis uses carbon dioxide and water to produce sugars from which other organic compounds can be constructed, and oxygen is produced as a by - product. Ribulose - 1, 5 - bisphosphate carboxylase oxygenase, commonly abbreviated to RuBisCO, is the enzyme involved in the first major step of carbon fixation, the production of two molecules of 3 - phosphoglycerate from CO and ribulose bisphosphate, as shown in the diagram at left. RuBisCO is thought to be the single most abundant protein on Earth. Phototrophs use the products of their photosynthesis as internal food sources and as raw material for the biosynthesis of more complex organic molecules, such as polysaccharides, nucleic acids and proteins. These are used for their own growth, and also as the basis of the food chains and webs that feed other organisms, including animals such as ourselves. Some important phototrophs, the coccolithophores synthesise hard calcium carbonate scales. A globally significant species of coccolithophore is Emiliania huxleyi whose calcite scales have formed the basis of many sedimentary rocks such as limestone, where what was previously atmospheric carbon can remain fixed for geological timescales. Plants can grow as much as 50 percent faster in concentrations of 1,000 ppm CO when compared with ambient conditions, though this assumes no change in climate and no limitation on other nutrients. Elevated CO levels cause increased growth reflected in the harvestable yield of crops, with wheat, rice and soybean all showing increases in yield of 12 -- 14 % under elevated CO in FACE experiments. Increased atmospheric CO concentrations result in fewer stomata developing on plants which leads to reduced water usage and increased water - use efficiency. Studies using FACE have shown that CO enrichment leads to decreased concentrations of micronutrients in crop plants. This may have knock - on effects on other parts of ecosystems as herbivores will need to eat more food to gain the same amount of protein. The concentration of secondary metabolites such as phenylpropanoids and flavonoids can also be altered in plants exposed to high concentrations of CO. Plants also emit CO during respiration, and so the majority of plants and algae, which use C3 photosynthesis, are only net absorbers during the day. Though a growing forest will absorb many tons of CO each year, a mature forest will produce as much CO from respiration and decomposition of dead specimens ( e.g., fallen branches ) as is used in photosynthesis in growing plants. Contrary to the long - standing view that they are carbon neutral, mature forests can continue to accumulate carbon and remain valuable carbon sinks, helping to maintain the carbon balance of Earth 's atmosphere. Additionally, and crucially to life on earth, photosynthesis by phytoplankton consumes dissolved CO in the upper ocean and thereby promotes the absorption of CO from the atmosphere. Toxicity See also : Carbon dioxide poisoning Main symptoms of carbon dioxide toxicity, by increasing volume percent in air. Carbon dioxide content in fresh air ( averaged between sea - level and 10 kPa level, i.e., about 30 km ( 19 mi ) altitude ) varies between 0.036 % ( 360 ppm ) and 0.041 % ( 410 ppm ), depending on the location. CO is an asphyxiant gas and not classified as toxic or harmful in accordance with Globally Harmonized System of Classification and Labelling of Chemicals standards of United Nations Economic Commission for Europe by using the OECD Guidelines for the Testing of Chemicals. In concentrations up to 1 % ( 10,000 ppm ), it will make some people feel drowsy and give the lungs a stuffy feeling. Concentrations of 7 % to 10 % ( 70,000 to 100,000 ppm ) may cause suffocation, even in the presence of sufficient oxygen, manifesting as dizziness, headache, visual and hearing dysfunction, and unconsciousness within a few minutes to an hour. The physiological effects of acute carbon dioxide exposure are grouped together under the term hypercapnia, a subset of asphyxiation. Because it is heavier than air, in locations where the gas seeps from the ground ( due to sub-surface volcanic or geothermal activity ) in relatively high concentrations, without the dispersing effects of wind, it can collect in sheltered / pocketed locations below average ground level, causing animals located therein to be suffocated. Carrion feeders attracted to the carcasses are then also killed. Children have been killed in the same way near the city of Goma by CO emissions from the nearby volcano Mt. Nyiragongo. The Swahili term for this phenomenon is ' mazuku '. Rising levels of CO threatened the Apollo 13 astronauts who had to adapt cartridges from the command module to supply the carbon dioxide scrubber in the lunar module, which they used as a lifeboat. Adaptation to increased concentrations of CO occurs in humans, including modified breathing and kidney bicarbonate production, in order to balance the effects of blood acidification ( acidosis ). Several studies suggested that 2.0 percent inspired concentrations could be used for closed air spaces ( e.g. a submarine ) since the adaptation is physiological and reversible, as decrement in performance or in normal physical activity does not happen at this level of exposure for five days. Yet, other studies show a decrease in cognitive function even at much lower levels. Also, with ongoing respiratory acidosis, adaptation or compensatory mechanisms will be unable to reverse such condition. Below 1 % There are few studies of the health effects of long - term continuous CO exposure on humans and animals at levels below 1 %. Occupational CO exposure limits have been set in the United States at 0.5 % ( 5000 ppm ) for an eight - hour period. At this CO concentration, International Space Station crew experienced headaches, lethargy, mental slowness, emotional irritation, and sleep disruption. Studies in animals at 0.5 % CO have demonstrated kidney calcification and bone loss after eight weeks of exposure. A study of humans exposed in 2.5 hour sessions demonstrated significant effects on cognitive abilities at concentrations as low as 0.1 % ( 1000ppm ) CO likely due to CO induced increases in cerebral blood flow. Another study observed a decline in basic activity level and information usage at 1000 ppm, when compared to 500 ppm. Ventilation Poor ventilation is one of the main causes of excessive CO concentrations in closed spaces. Carbon dioxide differential above outdoor concentrations at steady state conditions ( when the occupancy and ventilation system operation are sufficiently long that CO concentration has stabilized ) are sometimes used to estimate ventilation rates per person. Higher CO concentrations are associated with occupant health, comfort and performance degradation. ASHRAE Standard 62.1 -- 2007 ventilation rates may result in indoor concentrations up to 2,100 ppm above ambient outdoor conditions. Thus if the outdoor concentration is 400 ppm, indoor concentrations may reach 2,500 ppm with ventilation rates that meet this industry consensus standard. Concentrations in poorly ventilated spaces can be found even higher than this ( range of 3,000 or 4,000 ). Miners, who are particularly vulnerable to gas exposure due to an insufficient ventilation, referred to mixtures of carbon dioxide and nitrogen as `` blackdamp, '' `` choke damp '' or `` stythe. '' Before more effective technologies were developed, miners would frequently monitor for dangerous levels of blackdamp and other gases in mine shafts by bringing a caged canary with them as they worked. The canary is more sensitive to asphyxiant gases than humans, and as it became unconscious would stop singing and fall off its perch. The Davy lamp could also detect high levels of blackdamp ( which sinks, and collects near the floor ) by burning less brightly, while methane, another suffocating gas and explosion risk, would make the lamp burn more brightly. Human Physiology Content Reference ranges or averages for partial pressures of carbon dioxide ( abbreviated pCO ) kPa mmHg Venous blood carbon dioxide 5.5 -- 6.8 41 -- 51 Alveolar pulmonary gas pressures 4.8 36 Arterial blood carbon dioxide 4.7 -- 6.0 35 -- 45 The body produces approximately 2.3 pounds ( 1.0 kg ) of carbon dioxide per day per person, containing 0.63 pounds ( 290 g ) of carbon. In humans, this carbon dioxide is carried through the venous system and is breathed out through the lungs, resulting in lower concentrations in the arteries. The carbon dioxide content of the blood is often given as the partial pressure, which is the pressure which carbon dioxide would have had if it alone occupied the volume. In humans, the blood carbon dioxide contents is shown in the table to the right : Transport in the blood CO is carried in blood in three different ways. ( The exact percentages vary depending whether it is arterial or venous blood ). Most of it ( about 70 % to 80 % ) is converted to bicarbonate ions HCO by the enzyme carbonic anhydrase in the red blood cells, by the reaction CO + H O → H CO → H + HCO. 5 % -- 10 % is dissolved in the plasma 5 % -- 10 % is bound to hemoglobin as carbamino compounds Hemoglobin, the main oxygen - carrying molecule in red blood cells, carries both oxygen and carbon dioxide. However, the CO bound to hemoglobin does not bind to the same site as oxygen. Instead, it combines with the N - terminal groups on the four globin chains. However, because of allosteric effects on the hemoglobin molecule, the binding of CO decreases the amount of oxygen that is bound for a given partial pressure of oxygen. This is known as the Haldane Effect, and is important in the transport of carbon dioxide from the tissues to the lungs. Conversely, a rise in the partial pressure of CO or a lower pH will cause offloading of oxygen from hemoglobin, which is known as the Bohr effect. Regulation of respiration This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( June 2014 ) Carbon dioxide is one of the mediators of local autoregulation of blood supply. If its concentration is high, the capillaries expand to allow a greater blood flow to that tissue. Bicarbonate ions are crucial for regulating blood pH. A person 's breathing rate influences the level of CO in their blood. Breathing that is too slow or shallow causes respiratory acidosis, while breathing that is too rapid leads to hyperventilation, which can cause respiratory alkalosis. Although the body requires oxygen for metabolism, low oxygen levels normally do not stimulate breathing. Rather, breathing is stimulated by higher carbon dioxide levels. As a result, breathing low - pressure air or a gas mixture with no oxygen at all ( such as pure nitrogen ) can lead to loss of consciousness without ever experiencing air hunger. This is especially perilous for high - altitude fighter pilots. It is also why flight attendants instruct passengers, in case of loss of cabin pressure, to apply the oxygen mask to themselves first before helping others ; otherwise, one risks losing consciousness. The respiratory centers try to maintain an arterial CO pressure of 40 mm Hg. With intentional hyperventilation, the CO content of arterial blood may be lowered to 10 -- 20 mm Hg ( the oxygen content of the blood is little affected ), and the respiratory drive is diminished. This is why one can hold one 's breath longer after hyperventilating than without hyperventilating. This carries the risk that unconsciousness may result before the need to breathe becomes overwhelming, which is why hyperventilation is particularly dangerous before free diving. See also Chemistry portal Acidosis Alkalosis Arterial blood gas Bosch reaction Bottled gas Carbogen Carbon dioxide sensor Carbon sequestration EcoCute -- as refrigerants Emission standards Indoor air quality Kaya identity Lake Kivu List of least carbon efficient power stations List of countries by carbon dioxide emissions Meromictic lake pCO2 Gilbert Plass ( early work on CO and climate change ) Sabatier reaction NASA 's Orbiting Carbon Observatory 2 and Greenhouse Gases Observing Satellite References ^ Jump up to : `` Carbon Dioxide '' ( PDF ). Air Products. ^ Jump up to : `` NIOSH Pocket Guide to Chemical Hazards # 0103 ''. National Institute for Occupational Safety and Health ( NIOSH ). Jump up ^ `` Carbon dioxide ''. Immediately Dangerous to Life and Health Concentrations ( IDLH ). 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Bibcode : 2008Natur. 455... 213L. doi : 10.1038 / nature07276. PMID 18784722. Jump up ^ Falkowski P, Scholes RJ, Boyle E, Canadell J, Canfield D, Elser J, Gruber N, Hibbard K, Högberg P, Linder S, Mackenzie FT, Moore B 3rd, Pedersen T, Rosenthal Y, Seitzinger S, Smetacek V, Steffen W ( 2000 ). `` The global carbon cycle : a test of our knowledge of earth as a system ''. Science. 290 ( 5490 ) : 291 -- 296. Bibcode : 2000Sci... 290... 291F. doi : 10.1126 / science. 290.5490. 291. PMID 11030643. ^ Jump up to : Friedman, Daniel. Toxicity of Carbon Dioxide Gas Exposure, CO Poisoning Symptoms, Carbon Dioxide Exposure Limits, and Links to Toxic Gas Testing Procedures. InspectAPedia Jump up ^ `` CarbonTracker CT2011_oi ( Graphical map of CO ) ''. esrl.noaa.gov. Jump up ^ `` Carbon Dioxide as a Fire Suppressant : Examining the Risks ''. U.S. Environmental Protection Agency :. Jump up ^ Volcano Under the City. PBS.org ( 1 November 2005 ). Jump up ^ Glatte Jr H.A. ; Motsay G.J. ; Welch B.E. ( 1967 ). `` Carbon Dioxide Tolerance Studies ''. Brooks AFB, TX School of Aerospace Medicine Technical Report. SAM - TR - 67 - 77. Retrieved 2008 - 05 - 02. Jump up ^ Lambertsen, C.J. ( 1971 ). `` Carbon Dioxide Tolerance and Toxicity ''. Environmental Biomedical Stress Data Center, Institute for Environmental Medicine, University of Pennsylvania Medical Center. IFEM. Philadelphia, PA. Report No. 2 - 71. Retrieved 2008 - 05 - 02. ^ Jump up to : Satish U. ; Mendell M.J. ; Shekhar K. ; Hotchi T. ; Sullivan D. ; Streufert S. ; Fisk W.J. ( 2012 ). `` Is CO an Indoor Pollutant ? Direct Effects of Low - to - Moderate CO Concentrations on Human Decision - Making Performance '' ( PDF ). Environmental Health Perspectives. 120 ( 12 ). doi : 10.1289 / ehp. 1104789. ^ Jump up to : Joseph G. Allen ; Piers MacNaughton ; Usha Satish ; Suresh Santanam ; Jose Vallarino ; John D. Spengler ( 2016 ). `` Associations of Cognitive Function Scores with Carbon Dioxide, Ventilation, and Volatile Organic Compound Exposures in Office Workers : A Controlled Exposure Study of Green and Conventional Office Environments ''. Environmental Health Perspectives. 124 ( 6 ) : 805 -- 12. doi : 10.1289 / ehp. 1510037. PMC 4892924. PMID 26502459. Archived from the original on 23 January 2016. Jump up ^ `` Exposure Limits for Carbon Dioxide Gas -- CO Limits ''. InspectAPedia.com. Jump up ^ Law J. ; Watkins S. ; Alexander, D. ( 2010 ). `` In - Flight Carbon Dioxide Exposures and Related Symptoms : Associations, Susceptibility and Operational Implications '' ( PDF ). NASA Technical Report. TP -- 2010 -- 216126. Archived from the original ( PDF ) on 27 June 2011. Retrieved 2014 - 08 - 26. Jump up ^ Schaefer, K.E. ( 1979 ). `` Effect of Prolonged Exposure to 0.5 % CO on Kidney Calcification and Ultrastructure of Lungs ''. Undersea Biomed Res. S6 : 155 -- 161. PMID 505623. Retrieved 2014 - 10 - 19. ^ Jump up to : `` ABG ( Arterial Blood Gas ) ''. Brookside Associates. Retrieved 2017 - 01 - 02. Jump up ^ `` How much carbon dioxide do humans contribute through breathing ? ''. Archived from the original on 2011 - 02 - 02. Retrieved 2009 - 04 - 30. Jump up ^ Charles Henrickson ( 2005 ). Chemistry. Cliffs Notes. ISBN 0 - 7645 - 7419 - 1. ^ Jump up to : `` Carbon dioxide ''. solarnavigator.net. Retrieved 2007 - 10 - 12. Further reading Seppänen, O.A. ; Fisk, W.J. ; Mendell, M.J. ( December 1999 ). `` Association of Ventilation Rates and CO Concentrations with Health and Other Responses in Commercial and Institutional Buildings '' ( PDF ). Indoor Air. 9 ( 4 ) : 226 -- 252. doi : 10.1111 / j. 1600 - 0668.1999. 00003. x. Archived from the original ( PDF ) on 27 December 2016. Shendell, D.G. ; Prill, R. ; Fisk, W.J. ; Apte, M.G. ; Blake, D. ; Faulkner, D. ( October 2004 ). `` Associations between classroom CO concentrations and student attendance in Washington and Idaho '' ( PDF ). Indoor Air. 14 ( 5 ) : 333 -- 341. doi : 10.1111 / j. 1600 - 0668.2004. 00251. x. Archived from the original ( PDF ) on 27 December 2016. Soentgen, Jens ( February 2014 ). `` Hot air : The science and politics of CO ''. Global Environment. 7 ( 1 ) : 134 -- 171. doi : 10.3197 / 197337314X13927191904925. Good plant design and operation for onshore carbon capture installations and onshore pipelines : a recommended practice guidance document. Global CCS Institute. Energy Institute and Global Carbon Capture and Storage Institute. 1 Sep 2010. This new title is an essential guide for engineers, managers, procurement specialists and designers working on global carbon capture and storage projects. External links Wikimedia Commons has media related to Carbon dioxide. Library resources about Carbon dioxide Resources in your library Resources in other libraries International Chemical Safety Card 0021 Carbon dioxide MSDS by Amerigas in the SDSdata.org database. CDC -- NIOSH Pocket Guide to Chemical Hazards -- Carbon Dioxide CO Carbon Dioxide Properties, Uses, Applications Dry Ice information Trends in Atmospheric Carbon Dioxide ( NOAA ) `` A War Gas That Saves Lives ''. Popular Science, June 1942, pp. 53 -- 57. The on - line catalogue of CO natural emissions in Italy Reactions, Thermochemistry, Uses, and Function of Carbon Dioxide Carbon Dioxide -- Part One and Carbon Dioxide -- Part Two at The Periodic Table of Videos ( University of Nottingham ) Oxides Mixed oxidation states Antimony tetroxide ( Sb O ) Cobalt ( II, III ) oxide ( Co O ) Europium ( II, III ) oxide ( Eu O ) Iron ( II, III ) oxide ( Fe O ) Lead ( II, IV ) oxide ( Pb O ) Manganese ( II, III ) oxide ( Mn O ) Silver ( I, III ) oxide ( Ag O ) Triuranium octoxide ( U O ) Carbon suboxide ( C O ) Mellitic anhydride ( C O ) Praseodymium ( III, IV ) oxide ( Pr O ) Terbium ( III, IV ) oxide ( Tb O ) + 1 oxidation state Copper ( I ) oxide ( Cu O ) Dicarbon monoxide ( C O ) Dichlorine monoxide ( Cl O ) Gallium ( I ) oxide ( Ga O ) Lithium oxide ( Li O ) Potassium oxide ( K O ) Rubidium oxide ( Rb O ) Silver oxide ( Ag O ) Thallium ( I ) oxide ( Tl O ) Sodium oxide ( Na O ) Water ( hydrogen oxide ) ( H O ) + 2 oxidation state Aluminium ( II ) oxide ( Al O ) Barium oxide ( Ba O ) Beryllium oxide ( Be O ) Cadmium oxide ( Cd O ) Calcium oxide ( Ca O ) Carbon monoxide ( CO ) Chromium ( II ) oxide ( Cr O ) Cobalt ( II ) oxide ( Co O ) Copper ( II ) oxide ( Cu O ) Europium ( II ) oxide ( Eu O ) Germanium monoxide ( Ge O ) ) Iron ( II ) oxide ( Fe O ) Lead ( II ) oxide ( Pb O ) Magnesium oxide ( Mg O ) Manganese ( II ) oxide ( Mn O ) Mercury ( II ) oxide ( Hg O ) Nickel ( II ) oxide ( Ni O ) Nitric oxide ( N O ) Palladium ( II ) oxide ( Pd O ) Silicon monoxide ( Si O ) Strontium oxide ( Sr O ) Sulfur monoxide ( S O ) Disulfur dioxide ( S O ) Tin ( II ) oxide ( Sn O ) Titanium ( II ) oxide ( Ti O ) Vanadium ( II ) oxide ( V O ) Zinc oxide ( Zn O ) + 3 oxidation state Aluminium oxide ( Al O ) Antimony trioxide ( Sb O ) Arsenic trioxide ( As O ) Bismuth ( III ) oxide ( Bi O ) Boron trioxide ( B O ) Cerium ( III ) oxide ( Ce O ) Dibromine trioxide ( Br O ) Chromium ( III ) oxide ( Cr O ) Dinitrogen trioxide ( N O ) Dysprosium ( III ) oxide ( Dy O ) Erbium ( III ) oxide ( Er O ) Europium ( III ) oxide ( Eu O ) Gadolinium ( III ) oxide ( Gd O ) Gallium ( III ) oxide ( Ga O ) Holmium ( III ) oxide ( Ho O ) Indium ( III ) oxide ( In O ) Iron ( III ) oxide ( Fe O ) Lanthanum oxide ( La O ) Lutetium ( III ) oxide ( Lu O ) Manganese ( III ) oxide ( Mn O ) Neodymium ( III ) oxide ( Nd O ) Nickel ( III ) oxide ( Ni O ) Phosphorus trioxide ( P O ) Praseodymium ( III ) oxide ( Pr O ) Promethium ( III ) oxide ( Pm O ) Rhodium ( III ) oxide ( Rh O ) Samarium ( III ) oxide ( Sm O ) Scandium oxide ( Sc O ) Terbium ( III ) oxide ( Tb O ) Thallium ( III ) oxide ( Tl O ) Thulium ( III ) oxide ( Tm O ) Titanium ( III ) oxide ( Ti O ) Tungsten ( III ) oxide ( W O ) Vanadium ( III ) oxide ( V O ) Ytterbium ( III ) oxide ( Yb O ) Yttrium ( III ) oxide ( Y O ) + 4 oxidation state Americium dioxide ( Am O ) Carbon dioxide ( C O ) Carbon trioxide ( C O ) Cerium ( IV ) oxide ( Ce O ) Chlorine dioxide ( Cl O ) Chromium ( IV ) oxide ( Cr O ) Dinitrogen tetroxide ( N O ) Germanium dioxide ( Ge O ) Hafnium ( IV ) oxide ( Hf O ) Lead dioxide ( Pb O ) Manganese dioxide ( Mn O ) Neptunium ( IV ) oxide ( Np O ) Nitrogen dioxide ( N O ) Osmium dioxide ( Os O ) Plutonium ( IV ) oxide ( Pu O ) Praseodymium ( IV ) oxide ( Pr O ) Protactinium ( IV ) oxide ( Pa O ) Rhodium ( IV ) oxide ( Rh O ) Ruthenium ( IV ) oxide ( Ru O ) Selenium dioxide ( Se O ) Silicon dioxide ( Si O ) Sulfur dioxide ( S O ) Tellurium dioxide ( Te O ) Terbium ( IV ) oxide ( Tb O ) Thorium dioxide ( Th O ) Tin dioxide ( Sn O ) Titanium dioxide ( Ti O ) Tungsten ( IV ) oxide ( W O ) Uranium dioxide ( U O ) Vanadium ( IV ) oxide ( V O ) Zirconium dioxide ( Zr O ) + 5 oxidation state Antimony pentoxide ( Sb O ) Arsenic pentoxide ( As O ) Dinitrogen pentoxide ( N O ) Niobium pentoxide ( Nb O ) Phosphorus pentoxide ( P O ) Protactinium ( V ) oxide ( Pa O ) Tantalum pentoxide ( Ta O ) Vanadium ( V ) oxide ( V O ) + 6 oxidation state Chromium trioxide ( Cr O ) Molybdenum trioxide ( Mo O ) Rhenium trioxide ( Re O ) Selenium trioxide ( Se O ) Sulfur trioxide ( S O ) Tellurium trioxide ( Te O ) Tungsten trioxide ( W O ) Uranium trioxide ( U O ) Xenon trioxide ( Xe O ) Iridium trioxide ( Ir O ) + 7 oxidation state Dichlorine heptoxide ( Cl O ) Manganese heptoxide ( Mn O ) Rhenium ( VII ) oxide ( Re O ) Technetium ( VII ) oxide ( Tc O ) + 8 oxidation state Osmium tetroxide ( Os O ) Ruthenium tetroxide ( Ru O ) Xenon tetroxide ( Xe O ) Iridium tetroxide ( Ir O ) Hassium tetroxide ( Hs O ) Related Oxocarbon Suboxide Oxyanion Ozonide Peroxide Superoxide Oxides are sorted by oxidation state. Category : Oxides Oxocarbons Common oxides CO CO Exotic oxides CO CO CO CO O O O O O O O O O O O O O O O O O O O O O O O Polymers Graphite oxide C O CO CO Compounds derived from oxides Metal carbonyls Carbonic acid Bicarbonates Carbonates Dicarbonates Tricarbonates Inorganic compounds of carbon and related ions Compounds CBr CCl CF CF CI CO CO CO COS CS CS CSe C O SiC Carbon ions Carbides ( : C ≡ C : ), ( : : C : : ), ( : C = C = C : ) Cyanides ( : C ≡ N : ) Cyanates ( : O-C ≡ N : ) Thiocyanates ( : S-C ≡ N : ) Fulminates ( : C ≡ N-O : ) Thiofulminates ( : C ≡ N-S : ) Oxides and related Oxides Metal carbonyls Carbonic acid Bicarbonates Carbonates Global warming and climate change Temperatures Brightness temperature Effective temperature Geologic record Hiatus Historical climatology Instrumental record Paleoclimatology Paleotempestology Proxy data Record of the past 1,000 years Satellite measurements Causes Anthropogenic Attribution of recent climate change Aviation Biofuel Black carbon Carbon dioxide Deforestation Earth 's energy budget Earth 's radiation balance Ecocide Fossil fuel Global dimming Global warming potential Greenhouse effect ( Infrared window ) Greenhouse gases ( Halocarbons ) Land use, land - use change and forestry Radiative forcing Tropospheric ozone Urban heat island Natural Albedo Bond events Climate oscillations Climate sensitivity Cloud forcing Cosmic rays Feedbacks Glaciation Global cooling Milankovitch cycles Ocean variability AMO ENSO IOD PDO Orbital forcing Solar variation Volcanism Models Global climate model History History of climate change science Atmospheric thermodynamics Svante Arrhenius James Hansen Charles David Keeling Opinion and climate change Environmental ethics Media coverage of climate change Public opinion on climate change ( Popular culture ) Scientific opinion on climate change Scientists opposing the mainstream assessment Climate change denial Global warming conspiracy theory By country & region ( Africa Arctic Argentina Australia Bangladesh Belgium Canada China Europe European Union Finland Grenada Japan Luxembourg New Zealand Norway Russia Scotland South Korea Sweden Tuvalu United Kingdom United States ) Politics Clean Power Plan Climate change denial ( Manufactured controversy ) Intergovernmental Panel on Climate Change ( IPCC ) March for Science People 's Climate March United Nations Framework Convention on Climate Change ( UNFCCC / FCCC ) Global climate regime Potential effects and issues General Abrupt climate change Anoxic event Arctic dipole anomaly Arctic haze Arctic methane release Climate change and agriculture Climate change and ecosystems Climate change and gender Climate change and poverty Current sea level rise Drought Economics of global warming Effect on plant biodiversity Effects on health Effects on humans Effects on marine mammals Environmental migrant Extinction risk from global warming Fisheries and climate change Forest dieback Industry and society Iris hypothesis Megadrought Ocean acidification Ozone depletion Physical impacts Polar stratospheric cloud Regime shift Retreat of glaciers since 1850 Runaway climate change Season creep Shutdown of thermohaline circulation By country Australia South Asia India Nepal United States Mitigation Kyoto Protocol Clean Development Mechanism Joint Implementation Bali Road Map 2009 United Nations Climate Change Conference Governmental European Climate Change Programme G8 Climate Change Roundtable United Kingdom Climate Change Programme Paris Agreement United States withdrawal Regional climate change initiatives in the United States List of climate change initiatives Emissions reduction Carbon credit Carbon - neutral fuel Carbon offset Carbon tax Emissions trading Fossil - fuel phase - out Carbon - free energy Carbon capture and storage Efficient energy use Low - carbon economy Nuclear power Renewable energy Personal Individual action on climate change Simple living Other Carbon dioxide removal Carbon sink Climate change mitigation scenarios Climate engineering Individual and political action on climate change Reducing emissions from deforestation and forest degradation Reforestation Urban reforestation Climate Action Plan Climate action Proposed adaptations Strategies Damming glacial lakes Desalination Drought tolerance Irrigation investment Rainwater storage Sustainable development Weather modification Programmes Avoiding dangerous climate change Land allocation decision support system Glossary of climate change Index of climate change articles Category : Climate change Category : Global warming Portal : Global warming Molecules detected in outer space Molecules Diatomic Aluminium monochloride Aluminium monofluoride Aluminium monoxide Argonium Carbon monophosphide Carbon monosulfide Carbon monoxide Carborundum Cyanogen radical Diatomic carbon Fluoromethylidynium Hydrogen chloride Hydrogen fluoride Hydrogen ( molecular ) Hydroxyl radical Iron ( II ) oxide Magnesium monohydride cation Methylidyne radical Nitric oxide Nitrogen ( molecular ) Nitrogen monohydride Nitrogen sulfide Oxygen ( molecular ) Phosphorus monoxide Phosphorus mononitride Potassium chloride Silicon carbide Silicon mononitride Silicon monoxide Silicon monosulfide Sodium chloride Sodium iodide Sulfur monohydride Sulfur monoxide Titanium oxide Triatomic Aluminium hydroxide Aluminium isocyanide Amino radical Carbon dioxide Carbonyl sulfide CCP radical Chloronium Diazenylium Dicarbon monoxide Disilicon carbide Ethynyl radical Formyl radical Hydrogen cyanide ( HCN ) Hydrogen isocyanide ( HNC ) Hydrogen sulfide Hydroperoxyl Iron cyanide Isoformyl Magnesium cyanide Magnesium isocyanide Methylene radical Nitrous oxide Nitroxyl Ozone Phosphaethyne Potassium cyanide Protonated molecular hydrogen Sodium cyanide Sodium hydroxide Silicon carbonitride c - Silicon dicarbide Silicon naphthalocyanine Sulfur dioxide Thioformyl Thioxoethenylidene Titanium dioxide Tricarbon Water Four atoms Acetylene Ammonia Cyanic acid Cyanoethynyl Cyclopropynylidyne Formaldehyde Fulminic acid HCCN Hydrogen peroxide Hydromagnesium isocyanide Isocyanic acid Isothiocyanic acid Ketenyl Methylene amidogen Methyl radical Propynylidyne Protonated carbon dioxide Protonated hydrogen cyanide Silicon tricarbide Thioformaldehyde Tricarbon monoxide Tricarbon sulfide Thiocyanic acid Five atoms Ammonium ion Butadiynyl Carbodiimide Cyanamide Cyanoacetylene Cyanoformaldehyde Cyanomethyl Cyclopropenylidene Formic acid Isocyanoacetylene Ketene Methane Methoxy radical Methylenimine Propadienylidene Protonated formaldehyde Protonated formaldehyde Silane Silicon - carbide cluster Six atoms Acetonitrile Cyanobutadiynyl radical E-Cyanomethanimine Cyclopropenone Diacetylene Ethylene Formamide HC N Ketenimine Methanethiol Methanol Methyl isocyanide Pentynylidyne Propynal Protonated cyanoacetylene Seven atoms Acetaldehyde Acrylonitrile Vinyl cyanide Cyanodiacetylene Ethylene oxide Hexatriynyl radical Methylacetylene Methylamine Methyl isocyanate Vinyl alcohol Eight atoms Acetic acid Aminoacetonitrile Cyanoallene Ethanimine Glycolaldehyde Heptatrienyl radical Hexapentaenylidene Methylcyanoacetylene Methyl formate Propenal Nine atoms Acetamide Cyanohexatriyne Cyanotriacetylene Dimethyl ether Ethanol Methyldiacetylene Octatetraynyl radical Propene Propionitrile Ten atoms or more Acetone Benzene Benzonitrile Buckminsterfullerene ( C fullerene, buckyball ) C fullerene Cyanodecapentayne Cyanopentaacetylene Cyanotetra - acetylene Ethylene glycol Ethyl formate Methyl acetate Methyl - cyano - diacetylene Methyltriacetylene Propanal n - Propyl cyanide Pyrimidine Deuterated molecules Ammonia Ammonium ion Formaldehyde Formyl radical Heavy water Hydrogen cyanide Hydrogen deuteride Hydrogen isocyanide Methylacetylene Trihydrogen cation Unconfirmed Anthracene Dihydroxyacetone Ethyl methyl ether Glycine Graphene H NCO Linear C Naphthalene cation Phosphine Pyrene Silylidine Related Abiogenesis Astrobiology Astrochemistry Atomic and molecular astrophysics Chemical formula Circumstellar envelope Cosmic dust Cosmic ray Cosmochemistry Diffuse interstellar band Earliest known life forms Extraterrestrial life Extraterrestrial liquid water Forbidden mechanism Helium hydride ion Homochirality Intergalactic dust Interplanetary medium Interstellar medium Photodissociation region Iron -- sulfur world theory Kerogen Molecules in stars Nexus for Exoplanet System Science Organic compound Outer space PAH world hypothesis Panspermia Polycyclic aromatic hydrocarbon ( PAH ) RNA world hypothesis Spectroscopy Tholin Book : Chemistry Category : Astrochemistry Category : Molecules Portal : Astrobiology Portal : Astronomy Portal : Chemistry Inorganic compounds of carbon and related ions Compounds CBr CCl CF CF CI CO CO CO COS CS CS CSe C O SiC Carbon ions Carbides ( : C ≡ C : ), ( : : C : : ), ( : C = C = C : ) Cyanides ( : C ≡ N : ) Cyanates ( : O-C ≡ N : ) Thiocyanates ( : S-C ≡ N : ) Fulminates ( : C ≡ N-O : ) Thiofulminates ( : C ≡ N-S : ) Oxides and related Oxides Metal carbonyls Carbonic acid Bicarbonates Carbonates GND : 4031648 - 8 LCCN : sh85020108 NDL : 00568539 Oxygen compounds AgO Al O AmO Am O As O As O Au O B O BaO BeO Bi O BiO Bi O BrO Br O Br O CO CO C O CaO CaO CdO CeO Ce O Ce O ClO Cl O Cl O Cl O Cl O Cl O CoO Co O Co O CrO Cr O Cr O Cr O CsO Cs O CuO D O Dy O Er O Eu O OF O O FeO Fe O Fe O Ga O Ga O GeO GeO H O H O H O HfO HgO Hg O Ho O I O I O I O I O In O IrO KO K O La O Li O Li O Lu O MgO Mg O MnO MnO Mn O Mn O MoO MoO Mo O NO NO N O N O N O N O NaO Na O Na O NbO NbO Nd O Chemical formulas Retrieved from `` https://en.wikipedia.org/w/index.php?title=Carbon_dioxide&oldid=843612800 '' Categories : Carbon dioxide Acid anhydrides Acidic oxides Coolants Fire suppression agents Greenhouse gases Household chemicals Inorganic solvents Laser gain media Nuclear reactor coolants Oxocarbons Propellants Refrigerants Gaseous signaling molecules Heterocumulenes Hidden categories : CS1 maint : Uses authors parameter Wikipedia pending changes protected pages Use dmy dates from September 2016 Chemical articles with multiple compound IDs Multiple chemicals in an infobox that need indexing Articles with changed EBI identifier ECHA InfoCard ID from Wikidata E number from Wikidata Chemical articles having a data page Articles containing unverified chemical infoboxes Chembox image size set Articles to be expanded from June 2014 All articles to be expanded Articles using small message boxes Articles to be expanded from July 2014 All articles with unsourced statements Articles with unsourced statements from December 2016 Articles with unsourced statements from July 2015 Articles with unsourced statements from April 2017 Wikipedia articles needing clarification from June 2014 Articles with unsourced statements from June 2014 Articles with unsourced statements from July 2016 Articles needing additional references from June 2014 All articles needing additional references Wikipedia articles with GND identifiers Wikipedia articles with LCCN identifiers Talk Contents About Wikipedia Afrikaans Alemannisch አማርኛ Aragonés Asturianu تۆرکجه বাংলা Bân - 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Question: what is the freezing point of carbon dioxide
Answer: −78.5 °C (−109.3 °F; 194.7 K)