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buoyancy tank
buoy·an·cy tank (plural buoy·an·cy tanks)


noun 
Definition:
 
tank of air: a chamber containing air designed to keep a boat afloat if it is swamped or a hovercraft afloat when it is at rest
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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