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A unit used when measuring the pressure of the atmosphere. 33.86 millibars. Inches of mercury are used because some barometers use the height of mercury in a sealed tube as a measuring device. Inflatable ...
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aneroid barometer An instrument that measures and indicates air pressure; A mechanical device (rather than liquid, such as mercury). Air pressure is measured in millibars.
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See also: Boat, Sailboat, Set, Line, Point

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