What is atmospheric pressure??
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Atmospheric Pressure is 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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We all know that there is air all around us.It is the earth's gravitational pull that holds this air around us.This envelope of air, around the earth, is known as atmosphere. It extends up to nearly 1,000km above the surface of earth. The weight of this huge mass of air exerts a pressure, at all points and at all objects, on the earth. We call this pressure as the atmospheric pressure or air pressure
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