
Aneroid Barometer
An aneroid barometer is an instrument used to measure atmospheric pressure. It consists of a sealed metal container from which most of the air has been removed, and which therefore contracts or expands as the external pressure varies. This movement is then amplified and transmitted to a pointer on a dial, which indicates the pressure. Aneroid barometers are commonly used in aviation to measure the altitude of an aircraft. As an aircraft climbs or descends, the atmospheric pressure changes, and the aneroid barometer measures this change to determine the aircraft's altitude.
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