aneroid barometer

aneroid barometer n. A barometer in which variations of atmospheric pressure are indicated by the relative bulges of a thin elastic metal disk covering a partially evacuated chamber.

aneroid barometer Expansion or contraction of the vacuum chamber, caused by a change in air pressure, forces the pointer to move.

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aneroid barometer

Noun

a device for measuring air pressure, consisting of a partially evacuated chamber, in which variations in pressure cause a pointer on the lid to move [Greek a not + nēros wet]

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aneroid barometer  (n-roid) A barometer consisting of a thin elastic disk covering a chamber that contains a partial vacuum. High atmospheric pressure pushes against the disk and causes it to bulge inward, while low pressure does not push as hard, allowing the disk to bulge outward. An aneroid barometer is smaller and more portable than a mercury barometer and, when used with a barograph, can record up to a week's worth of data. Aneroid barometers are used extensively in aviation as part of altimeters.

aneroid barometer

Thesaurus

Noun

1.

aneroid barometer - a barometer that measures pressure without using fluids aneroid altimeter - an instrument that measures the height above ground; used in navigation barometer - an instrument that measures atmospheric pressure