6. What is atmospheric pressure?
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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 pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals
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