definition of atmospheric pressure
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Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air above that surface. ... The opposite is also true, where a reduction in the number of air molecules above a surface will result in a decrease in pressure.
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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 (roughly 14.6959 pounds per square inch).
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