Chemistry / Chem 1213 · Atom · ~20 seconds
Barometer
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A barometer measures atmospheric pressure from the height of a liquid column that atmospheric pressure alone supports in a closed, inverted tube.
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Mercury's high density lets a barometer stand about 760 millimeters tall at sea level, far shorter than a water barometer would need.
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A barometer measures the surrounding atmosphere's pressure, not the pressure of a gas trapped in any separate container.