the pressure exerted by air
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That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. ... One atmosphere is 1,013 millibars, or 760 millimeters (29.92 inches) of mercury. Atmospheric pressure drops as altitude increases.
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The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.
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