4. Atmospheric pressure
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The 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. ... One atmosphere is 1,013 millibars, or 760 millimeters (29.92 inches) of mercury.
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Atmospheric pressure is the force per unit area exerted by the weight of the atmosphere. To measure that weight, meteorologists use a barometer. It was Evangelista Torricelli, an Italian physicist and mathematician who proved in 1643 that he could weigh the atmosphere against a column of mercury.
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