What is air pressure - Definition and Meaning

Air Pressure :

Air pressure is the pressure or force exerted by the air on the earth atmosphere. As the altitude increases, atmospheric pressure gradually decreases.
Air pressure is usually measured using the Mercury barometer and Aneroid barometer.

Example :

In the lower altitude level, the air pressure increases Example - Ocean In the higher altitude level, the air pressure decreases Example - Mountain
Average daily census Avoirdupois System

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