Ballast-tank Definition

noun

One of several external or internal tanks fitted in submarines; when filled with seawater they allow the boat to submerge; when emptied using compressed air buoyancy is restored and the vessel rises towards the surface. Auxiliary ballast tanks within the pressure hull allow the submarine to be trimmed.

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Other Word Forms of Ballast-tank

Noun

Singular:
ballast-tank
Plural:
ballast-tanks

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