### fluid:

Air
* All air contains moisture
  - some form of pollutant
* All air contains water molecules in the form of water vapor, which is an invisible gas
  - vapour of varying quantities
  - enters the body through the nose or mouth
  - holds different amounts of water vapour
* Most air absorbs heat
* Most air affects astronomical refraction
  - human lungs
* Most air carries heat
  - sound
* Most air causes air pressure
  - erosion
  - low pressure
  - comes into lungs
  - consists of oxygen
* Most air contains air
  - airborne particles
  - carbon dioxide
  - chemicals
  - compounds
  - hydrogen
  - irritants
  - nitrogen gases
  - organic compounds
  - percent oxygen
  - pollutants
  - vital oxygen
* Most air contains volatile compounds
  - waste product carbon dioxide
* Most air contains water vapor air
* Most air creates pressure
  - sound waves
  - vacuums
  - enters oral cavities
* Most air flows into airways
  - alveoluses
  - nostrils
  - walls
  - out of lungs
  - generates powerful updrafts
  - gets temperature
* Most air goes into lungs
  - through lungs
* Most air has air pressure
  - concentration
  - conductivity
  - high humidity
  - little moisture
* Most air has low conductivity
  - thermal conductivity
* Most air has lower overall pressure
  - mass
  - relative humidity
  - uniform temperature
* Most air holds air
  - is expelled from lungs
* Most air is saturated with vapor
* Most air leads to convection
  - temperature fluctuations
* Most air passes over gills
* Most air passes through airways
  - feathers
  - metabolic chambers
* Most air raises air pressure
  - reaches temperature
  - reduces transpiration
  - removes water
* Some air absorbs energy
  - solar energy
  - affects breathe patterns
* Some air becomes humidity
* Some air carries diseases
  - infectious diseases
  - voltage
* Some air causes cancer
  - thunderstorms
  - vibration
  - combines with snow
  - comes from lungs
  - conducts electricity
* Some air contains cigarette smoke
  - grain
  - particulate matter
  - sulfur
  - urban particulate matter
  - contributes to fog
* Some air creates humidity
  - saturate humidity
  - snowfall
  - enters respiratory tracts
  - flows from balloons
* Some air flows into cavities
  - moist cavities
  - nasal cavities
  - over glaciers
* Some air flows through holes
  - larynxes
  - pharynxs
* Some air has chemical compositions
  - exact chemical compositions
  - kinetic energy
  - thermal energy
  - helps liverwort growth
* Some air holds more water vapor
  - induces current
* Some air is caused by smoke
  - saturated with water
  - trapped in the snow as the layers form
* Some air leads to condensation
  - leaves lungs
  - loses energy
  - passes from alveoluses
* Some air passes through bronchioles
* Some air passes through caudal air sacs
* Some air produces acid precipitation
  - reacts with zinc
  - remains in lungs
* Some air surrounds earth
  - planet earth
  - turns into liquid water
  - through their exoskeleton
* absorbs, or attenuates, the energy contained in sound waves.
* activated sludge and biological filters are two of many methods of secondary treatment.
* acts as the intermediary between fire and water.
* allows the most X-rays through the animal, resulting in a dark image.
* also acts as cooling agent and material removal agent
  - carries tiny particles of solid materials, such as dust
* also contains naturally occurring organic acids and acidic particles
  - small amounts of several other gases
  - very small amounts of several other gases
* also contains water droplets, dust, and other particles
  - vapour and hard matter such as dust, microbes and pollen
* also cools as heat radiates from it into space
  - it rises and expand
  - makes it possible for sound to travel to our ears
  - provides nitrogen which is fixed to the plants for utilisation
  - rotates around highs and lows, so that also has vorticity
* always contains some water.
* always moves from an area of high atmospheric pressure to an area of low atmospheric pressure
  - areas of high pressure to areas of low pressure
  - strives to become saturated
  - wants to move from high pressure to low pressure
* becomes buoyant when air near the ground becomes less dense than air that surrounds it.
* behaves much like a fluid, so the same is true for air.
* blowing in or out is common in caves
  - out to sea can cause intense allergy symptoms
  - over a wet surface also makes evaporation happen faster
* born mold can bring on some nasty respiratory problems, including asthma and emphysema.
* borne allergens are mold, pollen, animal dander, perfumes and colognes, and dust mites.
* brakes on a truck apply far more force that drivers can with just muscles.
* breaks down at three million volts per meter.
* brings lightness while water brings renewal of life.
* bubbling through a perforated pipe causes an upward water flow that slows the spread of oil.
* burst Immediately after a nuclear explosion, a huge, intensely hot fireball is formed.
* can absorb moisture
  - alter the pH, carbonate, and bicarbonate levels of the water
* can be a light breeze, a strong wind, fill up an empty space, and carry sound
  - inspiration as in breathing in all kinds of things
  - become very strong when it is moving and is wind
  - carry a certain amount of water vapour
  - change direction in a flash and change again just as quickly
  - clog the stem of flowers when the stem is trimmed
* can contain strong acids such as sulfuric and nitric acids
  - varying amounts of moisture depending upon the relative humidity
  - contains many gases including water vapor
* can enter our bodies through our mouths and noses
  - the body through the nostrils and the mouth
  - escape from the inside because there are very tiny holes in the eggshell
  - exert tremendous pressures as it heats and expands
  - hold more moisture at a high temperature than at a low one
* can hold only a certain amount of water vapor at a given temperature
  - of water vapour at any given temperature
  - infiltrate through cracks around doors and windows
  - leak around doors and windows, foundations, chimneys, exterior plumbing, etc
* can only hold a certain amount of water vapor
  - reach the lungs by way of the mouth
  - seep in around the edges and cause spoilage and mold
  - spread minute bacteria, fungus, spores and viruses as well as infectious micro-organisms
  - then easily pass through the vocal folds into the lungs
  - yearn for the fire, water can yearn for the fire, earth can yearn for the fire
  - moisture that can condense
  - much less energy than water, however, so much more of it is needed to spin rotors
* carrying precipitation, or water in the clouds, also comes from the Gulf of Mexico.
  - freezer burn, loss of nutrients and shortens storage life
* changes liquids.
* circulating fans make the human body feel cooler by radiation.
* comes in contact
  - the spiracles and goes to trachea, or tubes
* comes into contact
  - tracheae
* coming in contact with our skin conducts away heat.
* compresses easily as the pressure inside the brake lines increases.
* conditioned houses are usually too dry for carnivorous plants.
* conducts heat poorly
* consists of gases
  - percent nitrogen
  - mercury, especially in industrial areas
  - moisture which when cooled, seeks to drop out on a surface as condensation
* contains nitrogen gas and oxygen gas
  - nitrogen, which is harmful for some steel grades
  - oxygen which is required to combust fuel
* continues to flow down the larynx, the area where our vocal chords are found.
* contributes to movement.
* converges when it gets to the ground and turns counter clockwise in the Northern Hemisphere.
* cooling systems rely on heat sinks to pull the heat away from components.
* covers a larger area than all the oceans of water put together
  - the land, and the sea, and goes way past the earth's surface
* creates atmosphere pressure
  - whistle sound
* curing is accomplished mainly by mechanical ventilation inside buildings.
* destroys food.
* discouraging medium for a marine animal, so lets suppose it sinks.
* dissolves in liquids.
* does have a mass
  - much less so because of both lower density and much lower viscosity
* drifts from high to low pressure.
* dry away from direct heat
  - slowly or freeze
* dry the crystalline indole acetic acid
  - soil by spreading in a thin layer over a clean surface
* drying and floral pressing are age-old arts dating back to before Egyptian times
  - feet and socks during the day helps prevent blisters
  - helps to maintain healthy nipples
  - is also less harsh on clothes than tumbling around in a dryer
* drying is the easiest and cheapest way to dry flowers
  - most popular method of drying flowers
  - way to preserve flowers
  - most popular method used to dry herbs
* emits light.
* enhances respiration.
* entangled threads are used in everything from quilting mattresses to sewing heavy denim jeans.
* entering the nostrils is filtered by hairs, warmed and moistened.
* enters a human body through the nostrils
  - anterior sacs
  - body openings called spiracles and travels through trachea into sinuses
* enters caudal air sacs
  - cylinders
  - our lungs and fills our bronchial endings to capacity
  - rooms
  - the air passages trying to fill the vacuum, thereby, pulling air into the lungs
* enters the body through a series of passages, beginning with the nose or mouth
  - nostrils in front of their heads
  - the nose and mouth and passes into the throat
* enters the body through the nose, is warmed, filtered, and passed through the nasal cavity
  - is warmed,filtered, and passed through the nasal cavity
* enters the insect's body through valve-like openings in the exoskeleton, called spiracles
  - insects body through breathing pores called spiracles
  - leaves through small holes in the leaves called stomates
  - lungs through internal nares, which are located high in the forehead
  - mammalian respiratory system through the two external nares
  - nares and moves in the nasal cavity
  - nasal and oral cavities, and then flows through the pharynx, larynx and trachea
  - nose through the external nares
* enters the respiratory system either through the nose or mouth
  - through the mouth and nose, where it is warmed and moistened
  - when the chest expands
  - spiracles , and moves through the tracheal system
  - tracheae by pores called spiracles
  - tubes through a row of holes along an insect's abdomen
* enters through noses
  - trunks
  - windpipes
  - zones
* eventually sinks creating high pressures off the west coast of the Americas.
* exerts a downward pressure, which is referred to as atmospheric pressure.
* exists in soil to varying degrees, allowing for water molecules to move into topsoil layers.
* expanded lungs show both elastic and surface tension contributions to compliance.
* expands and thus cools.
* expands when heated so that a given volume weighs less than the same volume of cold air
  - heated, which makes it lighter than an equal volume of cool air
  - it is warmed becoming less dense than the surrounding air and therefore buoyant
  - temperature increases and contracts when it becomes cold
* expands when warmed and contracts when cold
* expands, and cools adiabatically.
* experiences friction with the ground.
* extends to the top of the atmosphere and exerts pressure on all the air below.
* falls in an anticyclone so no clouds are formed
  - high pressure areas
* filled lungs decrease electrical conduction.
* fills air sacs
  - posterior sacs
* flow around and over a building causes variations in pressure around it
  - away from a high is called anticyclonic
  - outward through a wall, building envelope, etc
  - over a liquid-coated surface
  - through a building envelope can carry with it significant amounts of heat and moisture
* flowing out of the subtropical highs towards the equator forms the trade winds
  - over the top of a wing also tends to flow inward toward the fuselage
  - through swollen or tight breathing tubes usually causes wheezing
* flows around a low pressure region counter-clockwise in the northern hemisphere
  - away from high-pressure regions called highs or anticyclones
  - completely around line, aiding in cooling of fluids
  - form areas of higher pressure to areas of lower pressure
  - freely through the airways
* flows from areas of high pressure to areas of low pressure to equalize the pressures
* flows from high pressure to low pressure
  - hot to cold
  - in and out of the lungs due to air pressure differences inside and outside of the lungs
  - in, oxygen diffuses into the blood and carbon dioxide diffuses into the air
* flows into the air spaces through the stoma
  - body whereupon oxygen is removed and transferred into the blood
  - lungs down the pressure gradient from the mouth to the alveoli
* flows over an airplane wing that is convex on the top and flat below
  - the surface of a car, over and under the body and through the engine and radiator
* flows through a series of conduction passageways that branch out from one another
  - channels
* flows through the lung in the same direction on inspiration and expiration
  - lungs into the expandable air sacs
  - soil and the oxygen in it is used by the microorganisms
  - toward low-pressure regions called lows or cyclones
* fluid that behaves just as do wet fluids such as water or oil
  - which moves in circuits, powered by unequal heating of large masses of air
* fluid, like water
  - made up primarily of nitrogen and oxygen
  - so wind behaves much like running water
  - the term in physics to describe any gas or liquid
* food's worst enemy, oxygen reacts with enzymes in the apple causing it to turn brown.
* gas and has no defined shape and no defined volume
  - properties, even though it is invisible
* gas, and air has pressure
  - gas fills spaces that are empty
  - water liquid, soil and minerals incorporate the solid
* goes through lungs
  - up in a low pressure system, taking evaporated moisture from the ground
* good electric insulator.
* governs the magick of the four winds, most divination
  - winds, most divinations, concentration and visualization magick
  - atoms and molecules
  - consequences
  - considerable power when placed under pressure
  - effects
  - mass, but it's relatively small per unit of volume
  - negative weight or no weight
  - power to push and pull on the birds, balloons, kites and planes
  - pressure too
  - quality
* has volume, is matter, and can be measured
  - mass, and density
* heated by the sun rises very swiftly, which creates areas of very low pressure.
* held in place by tiny fibers, is the only effective body insulator.
* helps keep the world warm enough to support life
  - with the decomposing process as well as odors
* hits surfaces.
* holding the maximum possible amount of water is said to be saturated.
  - more water vapor at a higher temperature than at a lower temperature
  - very little water
* homogeneous mixture.
* influences weather.
* inlets The air inlet is the most important part of the ventilation system.
* is absorbed by cells lining the middle ear, resulting in a vacuum.
* is accelerated by the fluid drive and circulates around the annular body
  - in direction of the velocity if the pressure goes down
* is actually a mixture of many different gasses
  - several different elements and compounds
  - added naturally to rivers when water goes through rapids and over falls
* is air - there is no difference between the air outside and the air inside
* is also a conductor of heat
  - very important in That it also plays a role in the growth of plants
  - an essential ingredient of ice cream
* is an example of matter
  - such a substance
  - excellent thermal insulator, but needs to be trapped, as in a blanket, to be effective
  - another important ingredient to healthy composting
  - associated with mental processes and communication
  - better insulation than fat except for deep-diving animals
* is blown into a room under pressure and the air leaving it is measured to calculate heat loss
  - over the water to evaporate the iodine
* is brought in the body through inhalation
  - into the body through spiracles located on each segment of the body
* is carried along on the rough surfaces of the sugar crystals
  - directly to cells by the tracheal tubes
  - cold and very drying and needs to be balanced by moisture and heat
  - compressed in a compressor, pushing the air molecules close together
  - conducted toward or away from lungs by series of cavities, tubes, and openings
  - considered to be a fluid
  - contaminated by droplets
* is cooled adiabatically as it rises up the slopes of hills and mountains
  - by compression and expansion
  - down and the temperature at which condensation begins is measured
  - critical as a source of oxygen gas and as a repository for excess carbon dioxide gas
  - decomposed in the lungs and therefore thought
* is drawn into the air sacs of the lungs, where oxygen from the air can enter the blood
  - lungs, gas exchange takes place at highly vascularized sacs
  - pharynx by muscle contraction that lowers the pharynx floor
* is drawn through a filter that collects dust and particulates
  - to remove dust, smoke, and pollen
* is drawn through the mouth and nose and then into the lungs
  - pores and forms an air cell at the larger end of the egg
  - easily accessible to humans, because it covers the entire surface of the earth
  - essential to life
* is everywhere and takes up space
  - in the earth's atmosphere
  - one and the same
  - exhausted during processing, and food shrinks
  - existence without form
  - feminine and has been associated with breath - the spirit or soul of all living creatures
  - forced into the lungs by raising the floor of the mouth
* is forced out of the lungs back up the trachea and out though the nose or mouth
  - when the muscles relax
* is forced to move faster over the top of the wing, reducing pressure, to create lift
  - rise and is warmed by the adiabatic process
  - found inside the egg in an air sac
  - freshest immediately after a thunderstorm
  - fuel for a brass instrument
  - fundamental for everyday activities and healthy living
* is heated and then rises, often pushed upward by heavier, cooler air masses
  - as it passes across the warming kiln elements
  - incidentally by a radiant heating system
* is heated instantly when an electrical charge of lightning passes through it
  - light passes through it
  - heavier than water vapor
  - humidified in the lungs
  - in constant motion around the world
  - inhaled and exhaled through the diver's nose
* is inhaled through the mouth or through the nose
  - inspired through the nostrils on the end of the trunk or through the mouth
* is less dense than water
  - viscous than honey, but the forces are still there
  - life, as life entails breath, it means breath
  - liquefied by passing it through a series of pressurized cooling systems
  - liquid upon waking
  - made o f ox ygen and carbon dioxide
* is made of many gases that are mixed together
  - molecules which have mass and therefore weight
* is made of molecules, and the molecules are made of protons, neutrons and electrons
  - therefore has mass
  - oxygen and carbon dioxide
  - particles that are in constant motion and air is actually quite heavy
  - up mostly of oxygen and nitrogen gas
* is made up of a mixture of gases including oxygen, nitrogen, helium, and others
  - gas molecules
  - gases like nitrogen, oxygen and carbon
* is made up of many gases, including oxygen and nitrogen
  - nitrogen, oxygen, hydrogen, etc
  - particles, that move to make the sound waves
* is made up of tiny molecules
  - many gases mixed together
  - matter because it is made up of atoms
* is mixed with the other reactants during shaking
  - wastewater, along with bacteria and other microorganisms
  - moistened by wet surfaces of air passages
* is more a necessity of life than either food or water
  - permeable to x-rays than body tissues
* is mostly nitrogen and oxygen
* is moved from the outside through the respiratory system into the lungs
  - instead into the central spaces of the lungs, where little nitrogen is absorbed
* is much less dense than a piece of fabric, so less heat is conducted through a layer of air
  - water, so the force needed to move through air is lower
  - efficient at emitting radiation than the surface
* is needed by animals to breathe and by plants to work with water and sunlight to make food
  - to keep alive the bacteria, which feed on the waste
  - non-toxic and necessary to support life
* is one of the best soundproofing materials
  - factors in the process of spoiling foods
  - most basic requirements for life
  - over seven times more dense than helium
  - passed through the molten metal
  - primarily oxygen and nitrogen
  - pulsed in and off-gases are pulsed out
* is pumped through an orifice immersed in liquid
  - the water to stimulate bacteria to feed on suspended and dissolved matter
* is pushed away from a high pressure system
  - into lungs by atmospheric pressure when volume increases
  - rarest of all commodities necessary for change
  - released in the direction of the water flow
  - required by organisms to cool their body
* is required for a fire to keep burning
  - the growth of the microbes
  - safe to breathe
  - saturated when it holds the maximum possible amount of water vapor
  - slower and lighter than water while sea-floor sediment is almost always faster and denser
  - so cold that wispy clouds can form even in the super-dry stratospheric air
  - sparged in at the bottom, to provide the micro-organisms with oxygen
  - sucked across the sea into the centre because of the low pressure
* is sucked into the lungs by muscular action
  - lungs, because the pressure in the airways is less than it is outside
  - swallowed during exercise or strenuous activities or when a dog gulps food or water
* is the Ayurvedic term for the gaseous form of matter
  - atmosphere by means of which all living organisms respire
  - basic medium of acoustic transmission
  - breath of life
  - commercial source for many of the gases it contains
  - dielectric in a variable capacitor
  - diffused breath
  - driving force in stimulating soil life
* is the element most repulsed by the human body, and the least able to feel and express emotions
  - of focus in the midst of chaos
  - enemy of ultrasound waves
  - fluid of gas molecules slamming into one another trying to spread out
* is the gaseous form of matter which is mobile and dynamic
  - state of matter whose characteristic is mobility
  - intermediary between heaven and earth, fire and water
  - layer of gases surrounding the earth's sphere
  - least opaque, and is usually referred to lucent
  - main ingredient to producing a singing tone
* is the most dynamic component of environment
  - familiar gaseous fluid
  - necessary element, being necessary to fire, earth and water
  - name given to atmosphere used in breathing and photosynthesis
* is the primary cause of food spoilage, so it allows food to stay fresh for years
  - food for our body's health
* is the primary food of both the mind and body
  - means of transportation year-round
  - slowest carrier of sound waves of the three
  - source of about a quarter of the nitrogen entering the Bay
  - thin, but radiation is intense causing molecules to break apart and free radical formation
  - thought to be heated and humidified as it is drawn past the conchae during breathing
  - too light to feel gravity
* is trapped and compressed by raising the glottis and tensing the pharyngeal wall
  - in alveoli which often causes rupturing of alveolar walls
* is trapped in the material used for composting
* is used as a heat transfer media and flows around the combustion chamber
  - heat carrier
* is used extensively as a refrigerant in aircraft cooling
  - for lighter cargo, small high-value items, and for urgent needs
  - for the oxidation process instead of chemicals such as chlorine or ozone
* is used to blow sand and debris from the cracks in the street
  - reciprocate a small piston very rapidly
  - vital to life on Earth and is necessary for plants, animals, and humans to live
* is warmed and filtered as it passes through the turbinates in the nose on the way to the lungs
  - as it passes over urban areas
  - warmed, humidified, and cleaned by the nose and lungs
  - warmer near the ground and gets colder higher up
  - water with holes in it
  - where freezer burn comes from
* lacks the supportive density and moisturizing qualities of water.
* layering good way to propagate from a tree that bears particularly good fruit
  - happens artificially
  - involves the wounding the stem of the plant while it is on the stock plant
* layering is most successful if done while a plant is growing actively
  - probably the easiest way to propagate a limited number of plants
  - the rooting of a stem terminal while it is still attached to the plant
* layering is useful for pot-grown plants that have become tall and spindly
  - when plants become too large for their growing area
  - technique invented by the Chinese four thousand years ago
  - daily fluctuations
* leads to wide daily fluctuations
* leaving a vessel in which pathogenic organisms are cultured is sterilized by heating
  - vessels in which pathogenic organisms are grown is sterilized by heating
* likes to go from areas of high pressure to low pressure
  - have moisture in it
* little sticky and resists the motion of objects going through it.
* masculine element and governs the magick of the four winds.
* masses that originate in the Gulf of Mexico tend to be warm and humid.
* medium just like water.
* meets air
  - canadian air
* meets cold air
  - warm air
* mixture of gaseous chemicals
  - gases, milk mixture of solids and liquids, alloys are mixtures of solids
  - gasses and it exists only as a gas
  - gasses, mainly nitrogen and oxygen
  - invisible, odorless, tasteless gases that surround the Earth
  - tiny gas molecules and small bits of solid stuff, like dust
* moves down the respiratory passages and the lungs expand
  - faster over a cambered , or arched, surface than over a flat surface
  - from places
  - out away from the center of high pressure
* moves through bronchioles
  - terminal bronchioles
* moving across the surface of the land constantly changes in both speed and direction
  - along the ground or over the sea, passes hills or mountains
  - around an object creates drag
* moving around the ball has a lower pressure than still air under the ball
  - vehicle is used to heat the liquid nitrogen to a boil
  - between the two regions is curved by the rotation of the earth to create our wind
  - from a high to low pressure creates moisture, which condenses into clouds or fog
  - in a horizontal plane from high pressure to low pressure regions is called wind
* moving through a room helps a person to feel less short of breath
  - narrowed airways causes wheezing and produces the coughing of asthma
  - the nose can dry and irritate the mucous membranes
* much better dielectric than solid polyethylene
  - more serious potential source of oxygen than is oxygen dissolved in liquid
* natural mixture in the gaseous state.
* naturally warms as it sinks, but dry air warms almost twice as fast as moist air.
* non-polluting and renewable resource.
* normally flows clockwise around a high pressure area, when the wind is in balance.
* notoriously poor conductor of electricity.
* occupies a smaller part than space and inherits the quality of sound from space
* only has pressure when it's moving.
* passes from the pharynx through the glottis into the trachea during inhalation
  - in and out of the spiracles to and from a network of tubes in the insect's abdomen
  - mountain top and falls, becoming warmer and increasing the moisture it can hold
  - or under the wing as the bird moves forward, or as the wind blows
  - the larynx into the windpipe and then into the lungs
* passes through the lungs twice with each breathing cycle - twice that of mammals
  - two times with each breathing cycle - twice that of mammals
  - pharynx en route to the trachea and lungs
  - tubes into the body tissues
* passing through a jet engine is heated up.
* physical substance which has weight.
* picks up a lot of moisture as it travels over an ocean.
* picks up heat as the winds blow over the oceans
  - by conduction but carries it away via convection
* plays a much more minor role in saturated soils than in unsaturated soil.
* plays an important role in our health
  - weather control
* point-up triangle with a line through the middle, and is yellow in color.
* poor conductor and is often used as insolator
  - of heat, at least when compared to aluminum
  - conductor, whatever the temperature
  - thermal conductor, so the more porous the soil, the less that it can conduct heat
* poorer conductor of sound than either solids or liquids.
* process gas as usually.
* produces sound.
* proves an essential part of plant growth and survival.
* provides fuel for fire and the combination of earth and water produce growth
  - life-giving oxygen
  - movement - such as in the joints, intestine or heart
  - plants with carbon dioxide
* pump An air pump has a multitude of uses, apart from the obvious one of inflating tyres.
* reaches correct temperature
* reaches the lungs by the same system as in humans
  - middle ear via the eustachian tube, which is connected to the back of the nose
* reacts like a fluid to supersonic objects.
* represents breathing and goodness.
* requires intake.
* resistant medium just like water.
* responds to lower pressure by expanding.
* rises in a depression so clouds and rainfall are formed
  - fluid environment
  - near low pressure areas
  - up the hillsides and thereby causes winds to blow
* rises when cold air pushes hot air up
  - it's heated because it expands, so it's less dense than the cooler air around it
* rising sharply creates tall clouds, such as thunderclouds, which give brief, heavy showers.
* rushing over the tops of airplane wings exerts less pressure than air from under the wings.
* sampling allows an industrial hygienist to determine the exposure levels of certain chemicals
  - is done on mainstream chemicals in the workplace
* scenting dogs use their noses to detect any human scent present in a particular area.
* sealing improves indoor air quality.
* shields the earth from harmful solar rays and objects from outer space hitting earth.
* slows moving objects.
* solution of gases.
* spaces greater than one cm are bullae.
* sparging can enhance bioremediation
  - is an in situ technology in which air is injected through a contaminated aquifer
* stops sound waves traveling through water and living tissues.
* stripping effectively removes radon gas from groundwater
  - involves the mass transfer of volatile contaminants from water to air
  - is more effective in coarse- grained soil
  - removes volatile organic compounds from contaminated groundwater or surface water
* stubborn opponent to the diffusion and expansion of steam.
* substance just as the dental floss or fishing line between the cups substance
  - that has weight and moves and behaves like a fluid
* supplies the oxygen a fire needs to burn.
* supports oxidation.
* surrounding the earth extends upwards hundreds of kilometers.
* surrounds Earth and becomes thinner farther from the surface
  - the earth like a large envelope
* sustains all living beings.
* takes on mass.
* takes up space - it consists of billions of air molecules
  - because it is made up of molecules
* takes up space, can hold things up and make things move
  - has weight, is odorless, colorless and tasteless
* tends to cool as it is forced upward
  - move air from regions of high pressure to regions of low pressure
* tends to move from areas of high pressure to areas of low pressure, creating wind
  - sink to the east of the ridge axis, which inhibits clouds and precipitation
  - sink, or subside, under high pressure
  - travel through the shortest path in stored rice
* then flows into the lungs from the higher pressure environment outside the body
  - invades the blood stream, resulting in immediate death
* too flows from one place to another.
* transfers heat.
* trapped between fibers provides great warmth in winter
  - in feathers or air in the swim bladder of a fish also help in floating
* traveling at a higher velocity creates a lower pressure than air traveling at lower velocity.
* travels back down the tracheae, carrying away gaseous waste to the outside of the insect's body.
* travels from areas of higher pressure to places where there is less pressure
  - the high pressure area to the low pressure area
* travelss through nostrils.
* treated with ozone is purified in milliseconds.
* usually moves from areas of higher pressure to areas of lower pressure.
* vents to allow efficient aeration for worms to breathe.
* very different fluid from water.
* very poor conductor of heat
* wants to flow from high pressure to low pressure.
* wills have distinct effects
+ Classical element: Ancient Greece :: Science
  * Air is both hot and wet.
+ Converter (metallurgy): Industries
  * However, steel becomes better if only oxygen is blown in. Air contains nitrogen, which is harmful for some steel grades. A modern converter called 'basic oxygen furnace' uses pure oxygen instead of air. It was invented 1949 in Austria.
+ Dew point: Weather :: Weather measurements
  * All air holds different amounts of water vapour. The dew point shows the amount of moisture in the air. The higher the dew point is, the higher the level of moisture in the air at a given temperature. The dew point of humid air will be higher than the dew point of dry air.
+ Inhalation: Respiratory system
  * Inhalation' is what occurs when people or animals breathe. Air is moved from the outside through the respiratory system into the lungs. The lungs take out some oxygen and put it into the blood. The air is then moved out of the lungs again.
+ Insect, Physiology, Respiratory and circulatory systems:
  * Insect respiration happens without lungs. There is a system of internal tubes and sacs through which gases diffuse or are actively pumped. Air is taken in through openings on the sides of the abdomen called spiracles. As larvae, many insects have gills that can extract oxygen dissolved in water, while others need to rise to the water surface to replenish air supplies which may be held or trapped in special structures.
+ Iodine, Preparation: Halogens :: Chemical elements :: Nonmetals
  * Kelp was burned and the iodine extracted from the ashes in the 18th and 19th century, but now it is not good enough for common use. Most iodine now is extracted from seawater. Chlorine is reacted with seawater to change the iodide to iodine. Air is blown over the water to evaporate the iodine. Then the iodine is reduced with sulfur dioxide to hydriodic acid. Then the hydriodic acid is oxidized with chlorine again to make iodine. This process is repeated until the iodine is pure.
+ Oxygen, Oxygen in nature
  * Air also contains oxygen. Air is made of many gases that are mixed together. Oxygen is especially important because all animals use oxygen to get energy from their food.
+ Precipitation: Meteorology :: Words
  * Condensations occurs when water molecules slow down as they cool and change into a solid or liquid. Condensation is the opposite of evaporation. When air rises, it cools by an adiabatic process. Air rises when cold air pushes hot air up. Cold air can push hot air up because hot air is less dense. Rain, snow, sleet, dew, frost, hail, and drizzle are all forms of precipitation. If liquid, it can be measured using a rain gauge. The most common form of solid precipitation is snow. Snow is made when temperatures are so cold that water vapor changes directly to solid crystals.
+ Spiracle: Insects
  * Insects have small holes in their bodies that allow them to breathe. These holes are called 'spiracles'. Air comes in the spiracles and goes to trachea, or tubes. These tubes take the oxygen to other parts of the insect body. Some insects can open and close the spiracles to keep water out.
  * It is the clear gas in which living things live and breathe. It has an indefinite shape and volume. It has no color or smell. It has mass and weight. It is a matter as it has mass and weight. Air creates atmosphere pressure. There is no air in the vacuum and cosmos.
+ Tipu's Tiger, Description: Woodwind instruments
  * The turning of a handle powers mechanisms inside the model. Air is sent through a pipe that makes sound, like the cries of the victim. The pitch of the 'wail pipe' changes as the man's arm moves. Inside the tiger's head air is pushed through two pipes to make a tiger's roar. The ivory keyboard which operates an organ is hidden.