Difine normal atmospheric pressure
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a value of standard or normal atmospheric pressure, equivalent to the pressure exerted by a column of mercury 29.92 inches (760 millimeters) high, or 1013 millibars (101.3 kilopascals).
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The standard, or near-average, atmospheric pressure at sea level on the Earth is 1013.25 millibars, or about 14.7 pounds per square inch. ... The pressure also varies by relatively small amounts as high and low pressure systems move past.
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