define atmospheric pressure
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Atmospheric pressure, also known as barometric pressure, is the pressure within the atmosphere of Earth. The standard atmosphere is a unit of pressure defined as 101,325 Pa, which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.
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The pressure that exerted by the weight of atmosphere , which at sea level has the mean value of 101,325 Pascal roughly 14,6959 pounds per square inch.
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