1. atmospheric pressure
Wikipedia definition
2. Atmospheric pressureAtmospheric pressure is the force per unit area exerted into a surface by the weight of air above that surface in the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the mass 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.
Read “Atmospheric pressure” on English Wikipedia
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Read “Atmospheric pressure” on DBpedia


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