what do you mean by atmospheric pressure???
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That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer. In a barometer, a column of mercury in a glass tube rises or falls as the weight of the atmosphere changes
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Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area). ... changes in atmospheric pressure with altitudeNear the surface of the Earth, atmospheric pressure decreases almost linearly with increasing altitude.
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