Water Le bar présente l'intérêt d'être voisin de l'atmosphère (pression atmosphérique moyenne à la surface de la mer).

Bar Kilopound per square inch (ksi) Keeping your tyre pressure where it's supposed to be can cut down on your fuel bills and make your car safer to drive. kgf/cm² De même, le bar absolu est également omis pour les faibles pressions où le contexte suffit à comprendre, puisque l'on sait généralement si 0,9 bar est une légère dépression ou une surpression à prendre en compte. Metre of water (mH2O)   9 decimals

"Bar(a)" and "bara" are sometimes used to indicate absolute pressures and "bar(g)" and "barg" for gauge pressures. It is defined as exactly equal to 100,000 Pa (100 kPa), or slightly less than the current average pressure at sea level (approximately 1.013 bar). Une unité de pression anglo-saxonne est la livre-force par pouce carré (en abrégé psi, de l'anglais pound-force per square inch).

Un bar vaut 105 pascals (soit 100 kPa ou 0,1 MPa) ou encore 100 kilonewtons par mètre carré (100 kN/m2 = 100 kPa) donc aussi 10 newtons par centimètre carré (1 daN/cm2). The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. Millibar 5 decimals Centimetre of water (cmH2O) [11] As a result, decibars are commonly used in oceanography. The kilobar, equivalent to 100 MPa, is commonly used in geological systems, particularly in experimental petrology. Pascal (Pa) The bar is still widely used in descriptions of pressure because it is about the same as atmospheric pressure. Bureau international des poids et mesures, https://fr.wikipedia.org/w/index.php?title=Bar_(unité)&oldid=174273052, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence. Technical atmosphere De manière abusive, on considère qu'un bar vaut un kilogramme-force par centimètre carré (kgf/cm2). Foot of water (ftH20) [2] 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". Mercury Ces notations sont cependant dépréciées. Millimetres of mercury (mmHg) 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. 2 decimals Megapascal (MPa) It's important that your tyre is making the correct amount of contact with the road - over or under-inflated tyres mean less grip on the tarmac. kgf/m²   Inch of mercury (inHg) It is defined as exactly equal to 100,000 Pa (100 kPa), or slightly less than the current average pressure at sea level (approximately 1.013 bar). Hors du Système international (SI), cette unité dérive de la barye (1 bar = 1 000 000 baryes), unité de pression du système CGS[2]. 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.

The word bar has its origin in the Greek word βάρος (baros), meaning weight.

Physical atmosphere (atm) It is equal to 0.987 atmospheres (101,325 Pa), the unit often used as a reference of standard pressure. Mercury Par contre, dans un procédé chimique, il peut être moins évident de savoir si une pression de 3 bar est relative ou absolue : la précision est alors nécessaire. 8 decimals Hectopascal (hPa) Hectopascal (hPa) In measurement of vacuum and in vacuum engineering, residual pressures are typically given in millibar, although torr or millimeter of mercury (mmHg) were historically common. Avoirdupois (U.S.) In sea water with respect to the gravity variation, the latitude and the geopotential anomaly the pressure can be converted into metres' depth according to an empirical formula (UNESCO Tech. Pound per square inch (psi) 5 in IAU Transactions XXB, 1989, Table 6, International Bureau of Weights and Measures, National Institute of Standards and Technology, Creative Commons Attribution-ShareAlike 3.0 Unported License, "Nomenclature of the unit of absolute pressure, Charles F. Marvin, 1918", NIST Special Publication 811, 2008 edition, "Canadian Weather at a Glance - Environment Canada", "Algorithms for computation of fundamental properties of seawater", "What do the letters 'g' and 'a' denote after a pressure unit?

For the informal unit of signal strength, see, International Astronomical Union Style Manual. Ce n'est qu'une approximation vraie à 2 % près, soit la différence entre le décanewton (10 N) et le kilogramme-force (9,806 65 N).

Le bar est utilisé dans les domaines de la plongée sous-marine, de l'océanographie, de l'industrie en général, et en particulier l'hydraulique industrielle ; en météorologie, on utilise surtout sa subdivision, le millibar (symbole mbar), équivalent à l’hectopascal (hPa) dans le Système international. Hors du Système international (SI), cette unité dérive de la barye (1 bar = 1 000 000 baryes), unité de pression du Système CGS2. Inch of mercury (inHg) Un article de Wikipédia, l'encyclopédie libre. 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. Avoirdupois (U.S.) Bar (Metric), pressure. Le bar (symbole bar) est une unité de mesure de la pression équivalente à 100 000 pascals1. Non-SI units accepted for use with the SI, US government atmospheric pressure map showing atmospheric pressure in mbar, https://en.wikipedia.org/w/index.php?title=Bar_(unit)&oldid=966978343, Wikipedia articles incorporating text from Citizendium, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 July 2020, at 11:31. Unicode has characters for "mb" (㏔, U+33D4) and "bar" (㍴, U+3374), but they exist only for compatibility with legacy Asian encodings and are not intended to be used in new documents. 7 decimals Pound per square inch (psi) Inch of water (inH2O) Bar 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. Foot of water (ftH20) Le mot provient du grec ancien βάρος / báros qui signifie lourd[3]. The bar is still widely used in descriptions of pressure because it is about the same as atmospheric pressure. Alors que le nom bar de l'unité s'accorde au pluriel (« la pression est mesurée en bars »), … kgf/m² 0 decimals Definition: A bar (symbol: bar) is a metric unit of pressure that is defined as exactly 100,000 pascals (symbol: Pa).   The bar (symbol bar) and the millibar (symbol mbar, also mb) are units of pressure.   Technical atmosphere [3], 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 has declined to include it among the "non-SI units accepted for use with the SI". Millimetres of mercury (mmHg) Metric 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. Centimetres of mercury (cmHg) The bar is a metric unit of pressure, but not part of the International System of Units (SI). Comm. The bar is defined using the SI derived unit, pascal: 1 bar ≡ 100,000 Pa ≡ 100,000 N/m2. Between 1793 and 1795, the word bar was used for a unit of weight in an early version of the metric system.

Pour plus de précision, on distingue souvent le « bar gauge » (noté barg, ou bar (g) en abréviation anglo-saxonne), dont le zéro correspond à la pression atmosphérique. The notation bar(g), though deprecated by various bodies,[2] represents gauge pressure, i.e., pressure in bars above ambient or atmospheric pressure.   Pound per square foot (psf) 3 decimals [6], Atmospheric air pressure is often given in millibars, where standard atmospheric pressure is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about 14.7 pounds per square inch. (adsbygoogle = window.adsbygoogle || []).push({}); Pascal (Pa) For example, the weather office of Environment Canada uses kilopascals and hectopascals on their weather maps. Le bar (symbole bar) est une unité de pression exactement égale à 100 000 pascals[1]. Millibar

Tire pressure is often specified in bars. Units derived from the bar include the megabar (symbol: Mbar), kilobar (symbol: kbar), decibar (symbol: dbar), centibar (symbol: cbar), and millibar (symbol: mbar). Specifically, an increase of 1 decibar occurs for every 1.019716 m increase in depth. They are not SI units, but accepted (although discouraged) for use with the SI. Inch of water (inH2O)   Torr (torr) Water Torr (torr) [2][12], This article is about the unit of pressure. Pour plus de précision, on évoque parfois le bar jauge (noté barg), dont le zéro correspond à la pression atmosphérique, afin de le distinguer du bar absolu (noté bara), dont le zéro correspond au vide. [4] The International Astronomical Union (IAU) also lists it under "Non-SI units and symbols whose continued use is deprecated".[5]. By the barometric formula, 1 bar is roughly the atmospheric pressure on Earth at an altitude of 111 metres at 15 °C. The bar (symbol bar) and the millibar (symbol mbar, also mb) are units of pressure. They are not SI units, but accepted (although discouraged) for use with the SI. Metric 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. Kilopascal (kPa)   Ce « bar relatif » est distinct du « bar absolu » (noté bara ou bar (a)), dont le zéro correspond au vide[4]. Kilopascal (kPa) Centimetres of mercury (cmHg) Le bar gauge est souvent utilisé dans la vie courante sans précision, comme pour exprimer la pression de pneus d'automobile. 4 decimals  

(FAQ - Pressure) : FAQs : Reference : National Physical Laboratory", Official SI website: Table 8.

Type the number of Bar you want to convert in the text box, to see the results in the table. Metre of water (mH2O) 6 decimals

Pound per square foot (psf) In the automotive field, turbocharger boost is often described in bars outside the United States.

The bar is a metric unit of pressure, but not part of the International System of Units (SI). Paper 44, p. Alors que le nom « bar » de l'unité s'accorde au pluriel (« la pression est mesurée en bars »), le symbole « bar » est invariable, comme le sont tous les symboles d'unités[5]. 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. Achat en ligne bar pressure pas cher sur Aliexpress France ! Atmosphere Megapascal (MPa) Les écritures suivantes sont possibles : 2 bars ou 2 bar, pression mesurée en millibars ou en mbar : 1 013 millibars ou 1 013 mbar. kgf/cm² 1 decimals [1][2] By the barometric formula, 1 bar is roughly the atmospheric pressure on Earth at an altitude of 111 metres at 15 °C. 100 psi = 6,89 bar. Livraison rapide Produits de qualité à petits prix Aliexpress : Achetez malin, vivez mieux This usage is deprecated and fuller descriptions such as "gauge pressure of 2 bar" or "2-bar gauge" are recommended. Le bar présente l'intérêt d'être voisin de l'atmosphère (pression atmosphérique moyenne à la surface de la mer). Atmosphere Physical atmosphere (atm) 10 decimals. Centimetre of water (cmH2O) Kilopound per square inch (ksi) [7][8] In contrast, Americans are familiar with the use of the millibar in US reports of hurricanes and other cyclonic storms.[9][10]. La dernière modification de cette page a été faite le 30 août 2020 à 15:28. 25). [1] The bar has been legally recognised in countries of the European Union since 2004.