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Definition of Ballast tank
1. 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. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Ballast Tank
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