The average atmospheric pressure at sea level is exactly 1013.25 millibars. This value represents the standard weight of the entire column of air above a single point at sea level. It is also equivalent to 760 millimeters of mercury or ...
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The stratosphere is the atmospheric region located directly above the troposphere and below the mesosphere. It starts at the tropopause and extends upward to an altitude of about fifty kilometers. Unlike the layer below it, the stratosphere is characterized by ...