Answer
Air pressure decreases with an increase in altitude. As one ascends into the atmosphere, the air becomes less dense due to the decreasing weight of the overlying air. The pressure change is not constant but follows a gradual exponential decrease. In the lower layers of the atmosphere, the troposphere, the rate of pressure decrease with altitude is relatively constant and averages about 1 hectopascal (hPa) per 8 meters (26 feet) of ascent. However, as we move higher into the stratosphere and beyond, the rate of pressure change becomes more variable due to different atmospheric conditions.
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