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To find the Specific Gravity of a Body Lighter than Water

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-151

2025-11-09

694

Since the buoyant force of the water is greater than the weight of the body, it will float, and it must be fastened to a heavy body in order to submerge it. The specific gravity can be found as follows:

 Weigh the body in air (IW), then weigh a heavy sinker in water and call its apparent weight S. Tie the sinker to the body and weigh them both in water. Call the apparent weight W". Compute the specific gravity from the

EXAMPLE. - Suppose a piece of wood weighs 40 g. in air (W), a sinker registers 50 g. in water (S), and the two when tied together and submerged register 30 g. (W"). It is evident that the wood not only displaces its own weight of water, but buoys up 20 g. of the weight of the sinker; therefore the wood displaces 40 +20 g. of water, hence its specific gravity is