Define atmospheric pressure how does it vary with altitude?
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Pressure with Height: pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.
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Air pressure decreases rapidly with height in the lower atmosphere. The pressure decreases by 1 hectopascal (millibar) for every 10 meters (33 feet) of ascent in the lower troposphere. At an altitude of around 500 hectopascals (18,00 feet) the air pressure begins decreasing at a slower rate.
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