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What is Atmospheric pressure???????
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By definition atmospheric pressure is 'force per unit area exerted against a surface by the weight of air above that surface'. Atmospheric pressure is closely related to the hydrostatic pressure caused by the weight of air above the measurement point. ... Other equivalent units are 760 mmHg and 1013.25 millibars.
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It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.
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