Expansion or contraction of the vacuum chamber, caused by a change in air pressure, forces the pointer to move.
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.
(Physical Geography) a device for measuring atmospheric pressure without the use of fluids. It consists of a partially evacuated metal chamber, the thin corrugated lid of which is displaced by variations in the external air pressure. This displacement is magnified by levers and made to operate a pointer
a device for measuring atmospheric pressure, consisting of a chamber with a partial vacuum and an elastic cover and a pointer that registers compression of the cover by the air outside the chamber.
Expansion or contraction of the vacuum chamber, caused by a change in air pressure, forces the pointer to move.
an·er·oid barometer
(ăn′ə-roid′)
A barometer made up of a vacuum chamber covered by a thin elastic disk. 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.
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