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hydrostatic balance

British  

noun

  1. a balance for finding the weight of an object submerged in water in order to determine the upthrust on it and thus determine its relative density

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Thus, as the oil is gradually used the pressure of the water in the other leg of the hydrostatic balance raises the level of the remaining portion.

From Scientific American Supplement, No. 481, March 21, 1885 by Various

But the computer had already taken over, and was controlling the flow of water to the hydrostatic balance tank system, rapidly orienting the axis of spin against the true axis of the wheel.

From Where I Wasn't Going by Richmond, Walt