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measure of air pressure click to hear : measure of air pressure

Air pressure: force exerted by an atmospheric air column on a given surface; it is expressed in millibars.
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See measure of air pressure in : french | spanish
barograph mercury barometer

barograph click to hear : barograph

Instrument that measures variations in air pressure for a given interval.

mercury barometer click to hear : mercury barometer

Instrument that measures atmospheric pressure using a mercury column that rises and falls with variations in air pressure.