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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.
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Usage Ī tire-pressure gauge displaying bar (outside) and pounds per square inch (inside)Ītmospheric 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. Between 17, the word bar was used for a unit of weight in an early version of the metric system. 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. The word bar has its origin in the Ancient Greek word βάρος ( baros), meaning weight.