Metal bellows are elastic vessels that compress when pressure is applied to the outside and extend under vacuum. When the pressure or vacuum is released they return to their original shape, provided the material has not been stressed past its yield strength. They are used both for their ability to deform under pressure and to give a hermetic seal that still allows movement. Precision bellows technology of the 20th and 21st centuries centres on metal bellows, with less demanding uses served by rubber and plastic, and these bear little resemblance to the leather bellows once used in fireplaces and forges.
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Source Metal bellows - Wikipedia
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1. Metal bellows - Wikipedia
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Metal bellows are elastic vessels that can be compressed when pressure is applied to the outside of the vessel, or extended under vacuum.
In Sector: Industrials, Lead, first paragraph
They are used both for their ability to deform under pressure and to provide a hermetic seal that allows movement.
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