bathyscaph
Noun 1. navigable deep diving vessel for underwater exploration (synonym) bathyscaphe, bathyscape (hypernym) submersible | ||||
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Bathyscaph Definition from Entertainment & Music Dictionaries & Glossaries
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Bathyscaph
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Bathyscaph Definition from Encyclopedia Dictionaries & Glossaries
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Bathyscaphe
A bathyscape, bathyscaphe, or bathyscaph is a free-diving self-propelled deep-sea diving submersible, consisting of a crew cabin similar to a bathysphere suspended below a float (rather than from a surface cable, as in the classic bathysphere design)
The float is filled with petrol (gasoline) because this is readily available, buoyant, and for all practical purposes, incompressible. The incompressiblity of the petrol means the tanks can be very lightly constructed as the pressure inside and outside of the tanks equalises and they are not required to withstand any pressure differential at all. By contrast the crew cabin must withstand a huge pressure differential and is massively built. Buoyancy can be trimmed easily by replacing petrol with water, which is denser.
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