Atmospheric pressure is sometimes defined as the force per unit area exerted against a surface by the weight of air above that surface at any given point in the Earth's atmosphere.
In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.
Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location.
Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation.
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