evacuated bellows

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• bellows — Devices used for measuring pressure. They are circular corrugated metal capsules, which are either evacuated or filled with an inert gas. As the pressure changes, the bellows either contract or expand, and this expansion/contraction is converted… …   Aviation dictionary

• Metal bellows — are elastic vessels that can be compressed when pressure is applied to the outside of the vessel, or extended under vacuum. When the pressure or vacuum is released, the bellows will return to its original shape (provided the material has not been …   Wikipedia

• aneroid — 1. adjective Not using or containing fluid An evacuated bellows and mechanical linkage operates an aneroid barometer. 2. noun An aneroid barometer …   Wiktionary

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