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The bar is defined using the SI derived unit, pascal: 1 bar ≡ 100,000 Pa ≡ 100,000 N/m2. Thus, 1 baris equal to: 1. 1,000,000 Ba (barye) (in cgs units); and 1 bar is approximately equal to: 1. 0.987 atm 2. 14.5038 psiabsolute 3. 29.53 inHg 4. 750.062 mmHg 5. 750.069 Torr 6. 1019.72 centimetres of water (cmH2O)(1 bar approximately corresponds to the pressure of water at a depth of 10 meters). Notes: 1. 1 millibar (mbar) = 1 one-thousandth bar, or 1×10−3bar 2. 1 millibar = 1 hectopascal(1 hPa = 100 Pa).
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.
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. 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 hurricanesand 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 surfa...