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The SI unit is the pascal, equal to one newton per square meter.

A bar is exactly 100,000 pascal.

An atmosphere is approximately equal to a bar.

Torr means more or less the same as mmHg, and refers to the pressure caused by a liquid column of Mercury (Hg).

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12y ago
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AnswerBot

4mo ago

Pascal (Pa), bar (bar), and pounds per square inch (psi) are units commonly used to describe air pressure.

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Wiki User

12y ago

hectopascal (hPa) for atmospheric air pressure is preferred

kilopascals (kPa) is for similar pressures

i dont know the third one, sorry

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Wiki User

12y ago

Barometric is one

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Wiki User

11y ago

millibars, inches and atmosphere.

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Q: What are three units used to describe air pressure?
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