Bar ( unit ) - wikipedia Bar ( unit ) This article is about the unit of pressure. For other uses, see Bar ( disambiguation ). For the informal unit of signal strength, see Mobile phone signal. `` Kbar '' redirects here. For the knife, see Ka - Bar. Bar A pressure of 700 bar flattened this length of aluminium tubing, which had a wall thickness of 5 millimetres ( 0.20 in ) Unit information Unit system Metric system Unit of Pressure Symbol bar Unit conversions 1 bar in...... is equal to... SI units 100 kPa CGS units 1.0 × 10 Ba US customary units 14.50377 psi The bar is a metric unit of pressure, but is not approved as part of the International System of Units ( SI ). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. Use of the bar is deprecated by professional bodies in some fields. The International Bureau of Weights and Measures ( BIPM ) lists the bar as one of the `` non-SI units ( that authors ) should have the freedom to use '', but declines to include it among the `` Non-SI units accepted for use with the SI ''. The US National Institute of Standards and Technology ( NIST ) deprecates its use except for `` limited use in meteorology '' and lists it as one of several units that `` must not be introduced in fields where they are not presently used ''. The International Astronomical Union ( IAU ) also lists it under `` Non-SI units and symbols whose continued use is deprecated ''. As of 2004, the bar is legally recognized in countries of the European Union. Units derived from the bar include the megabar ( symbol : Mbar ), kilobar ( symbol : kbar ), decibar ( symbol : dbar ), centibar ( symbol : cbar ), and millibar ( symbol : mbar or mb ). The notation bar ( g ), though deprecated by various bodies, represents gauge pressure, i.e., pressure in bars above ambient or atmospheric pressure. Contents 1 Definition and conversion 2 Origin 3 Usage 4 See also 5 References 6 External links Definition and conversion The bar is defined using the SI derived unit, pascal : 7005100000000000000 ♠ 1 bar ≡ 100,000 Pa ≡ 100,000 N / m. Thus, 7005100000000000000 ♠ 1 bar is equal to : 1,000,000 Ba ( barye ) ( in cgs units ) ; and 1 bar is approximately equal to : 6999987000000000000 ♠ 0.987 atm 7005100000180828655 ♠ 14.5038 psi absolute 7001295300000000000 ♠ 29.53 inHg 7002750060000000000 ♠ 750.06 mmHg 7002750060000000000 ♠ 750.06 Torr 1019.72 centimetres of water ( cmH O ). Notes : 1 millibar ( mbar ) = 1 one - thousandth bar, or 6997100000000000000 ♠ 1 × 10 bar 1 millibar = 1 hectopascal ( 1 hPa = 100 Pa ). Origin The word bar has its origin in the Greek word βάρος ( baros ), meaning weight. The unit 's official symbol is bar ; the earlier symbol b is now deprecated and conflicts with the use of b denoting the unit barn, but it is still encountered, especially as mb ( rather than the proper mbar ) to denote the millibar. Between 1793 and 1795, the word bar was used for a unit of weight in an early version of the metric system. Usage Atmospheric air pressure is often given in millibars where standard sea level pressure is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about 14.7 pounds per square inch ( PSI ). Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibars as the values are convenient. After the advent of SI units, some meteorologists began using hectopascals ( symbol hPa ) which are numerically equivalent to millibars ; for the same reason, the hectopascal is now the standard unit used to express barometric pressures in aviation in most countries. For example, the weather office of Environment Canada uses kilopascals and hectopascals on their weather maps. In contrast, Americans are familiar with the use of the millibar in US reports of hurricanes and other cyclonic storms. In fresh water, there is an approximate numerical equivalence between the change in pressure in decibars and the change in depth from the water surface in metres. Specifically, an increase of 1 decibar occurs for every 1.019716 m increase in depth. In sea water with respect to the gravity variation, the latitude and the geopotential anomaly the pressure can be converted into meters depth according to an empirical formula ( UNESCO Tech. Paper 44, p. 25 ). As a result, decibars are commonly used in oceanography. Many engineers worldwide use the bar as a unit of pressure because, in much of their work, using pascals would involve using very large numbers. Engineers that specialize in technical safety for offshore petrochemical facilities would be expected to exclusively refer to explosion loads in units of bar or bars. A bar is a convenient unit of measure for pressures generated by low frequency vapor cloud explosions that are commonly considered as part of accidental loading risk studies. A tire pressure gauge displaying bar ( outside ) and Pounds per square inch ( inside ) In the automotive field, turbocharger boost is often described in bars outside the USA. Tire pressure is often specified in bar. Unicode has characters for `` mb '' ( mb, U + 33D4 ) and `` bar '' ( bar, U + 3374 ), but they exist only for compatibility with legacy Asian encodings and are not intended to be used in new documents. The kilobar, equivalent to 100 MPa, is commonly used in geological systems, particularly in experimental petrology. `` Bar ( a ) '' and `` bara '' are sometimes used to indicate absolute pressures and `` bar ( g ) '' and `` barg '' for gauge pressures. This usage is deprecated and fuller descriptions such as `` gauge pressure of 2 bar '' or `` 2 bar gauge '' are recommended. See also Centimetre of water Conversion of units Metric prefix Orders of magnitude ( pressure ) References This article incorporates material from the Citizendium article `` Bar ( unit ) '', which is licensed under the Creative Commons Attribution - ShareAlike 3.0 Unported License but not under the GFDL. ^ Jump up to : International Bureau of Weights and Measures ( 2006 ), The International System of Units ( SI ) ( PDF ) ( 8th ed. ), p. 127, ISBN 92 - 822 - 2213 - 6, archived ( PDF ) from the original on 2017 - 08 - 14. ^ Jump up to : British Standard BS 350 : 2004 Conversion Factors for Units Jump up ^ Nomenclature of the unit of absolut pressure, Charles F. Marvin, 1918 Jump up ^ NIST Special Publication 1038, Sec. 4.3. 2 ; NIST Special Publication 811, 2008 edition, Sec. 5.2 Jump up ^ International Astronomical Union Style Manual. Comm. 5 in IAU Transactions XXB, 1989, Table 6 Jump up ^ Grave ( unit ) Jump up ^ Environment Canada Weather Map Jump up ^ Weather - Environment Canada Jump up ^ http://unesdoc.unesco.org/images/0005/000598/059832eb.pdf Jump up ^ `` What do the letters ' g ' and ' a ' denote after a pressure unit ? ( FAQ - Pressure ) : FAQs : Reference : National Physical Laboratory ''. Retrieved 7 February 2016. External links Official SI website : Table 8. Non-SI units accepted for use with the SI Pressure units Pascal Bar Technical atmosphere Standard atmosphere Torr Pounds per square inch ( Pa ) ( bar ) ( at ) ( atm ) ( Torr ) ( psi ) 1 Pa ≡ 1 N / m 10 6995101970000000000 ♠ 1.0197 × 10 6994986919999999999 ♠ 9.8692 × 10 6997750060000000000 ♠ 7.5006 × 10 6996145037700000000 ♠ 1.450 377 × 10 1 bar 10 ≡ 100 kPa ≡ 10 dyn / cm 7000101970000000000 ♠ 1.0197 6999986920000000000 ♠ 0.986 92 7002750060000000000 ♠ 750.06 7001145037700000000 ♠ 14.503 77 1 at 7004980665000000000 ♠ 9.806 65 × 10 6999980665000000000 ♠ 0.980 665 ≡ 1 kp / cm 6999967841100000000 ♠ 0.967 8411 7002735559200000000 ♠ 735.5592 7001142233400000000 ♠ 14.223 34 1 atm 7005101325000000000 ♠ 1.013 25 × 10 7000101325000000000 ♠ 1.013 25 7000103319999999999 ♠ 1.0332 ≡ 7002760000000000000 ♠ 760 7001146959500000000 ♠ 14.695 95 1 Torr 7002133322399999999 ♠ 133.3224 6997133322400000000 ♠ 1.333 224 × 10 6997135955100000000 ♠ 1.359 551 × 10 ≡ 1 / 760 ≈ 6997131578900000000 ♠ 1.315 789 × 10 ≡ 1 Torr ≈ 1 mmHg 6998193367800000000 ♠ 1.933 678 × 10 1 psi 7003689480000000000 ♠ 6.8948 × 10 6998689480000000000 ♠ 6.8948 × 10 6998703069000000000 ♠ 7.030 69 × 10 6998680460000000000 ♠ 6.8046 × 10 7001517149300000000 ♠ 51.714 93 ≡ 1 lbf / in Retrieved from `` https://en.wikipedia.org/w/index.php?title=Bar_(unit)&oldid=801419094 '' Categories : Units of pressure Non-SI metric units Hidden categories : Articles containing Greek - language text All articles with unsourced statements Articles with unsourced statements from November 2012 Wikipedia articles incorporating text from Citizendium Talk Contents About Wikipedia Afrikaans Беларуская Беларуская ( тарашкевіца ) ‎ Български བོད ་ ཡིག Bosanski Català Čeština Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Français Gaeilge Galego 한국어 Հայերեն Hrvatski Bahasa Indonesia Íslenska Italiano עברית ქართული Latviešu Lietuvių Magyar Македонски Bahasa Melayu Монгол Nederlands 日本 語 Norsk Norsk nynorsk Oʻzbekcha / ўзбекча Piemontèis Plattdüütsch Polski Português Română Русский Sicilianu Simple English Slovenčina Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska தமிழ் ไทย Тоҷикӣ Türkçe Українська Tiếng Việt Winaray 粵語 中文 Edit links This page was last edited on 19 September 2017, at 15 : 22. 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Question: 1 bar of pressure equals how many psi
Answer: 14.50377 psi