Method
The following method has the advantage of needing no volume information of the body (see the note about the residual volume below). The procedure is based on Archimedes' principle, using the following three measurable values: The weight of the body outside the water, the weight of the completely immersed body (a weight that may be negative if the body in question is less dense than water) and the density of the water:
Multiplying by the density of water gives
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Read more about this topic: Hydrostatic Weighing
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