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buoyancy
The upward thrust exerted upon a body immersed in a fluid. Buoyancy is equal to the weight of the fluid displaced. (See Archimede's principle.) Thus a body weighs less when weighed in water, the apparent loss in weight being equal to the weight of the water displaced. For accurate weighing of bodies in air, a small allowance has to be made to correct for the buoyancy of the body.
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• CLASSICAL MECHANICS
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