Thus the specific gravity of the body is W W S = B = W -W Part B: Solid Less Dense Than Water Next consider a solid body less dense than water. The difference W-W, =B is the buoyant force exerted on the body by the water and, by Archimedes principle, is equal to the weight of the water displaced by the body. Part A: Solid More Dense Than Water Consider a solid denser than water, of weight W in the air, but which weighs w. Archimedes principle states: "A body immersed in a fluid is subject to a buoyant force equal to the weight of fluid displaced." Thus the weight of fluid displaced by an im mersed solid object may be obtained as the difference between what the solid object weighs when not immersed and what the object annars to weigh (ie, the weight minus the buoyant force) when immersed in the fluid. Equivalently, the specific gravity may be taken as the ratio of the weight (or mass) of the substance to the weight (or mass) of an equal volume of water. THEORY The specific gravity of a substance is the ratio of its density to the density of liquid water. These substances will include several solids more dense than water (Part A, at least one solid less dense than water (Part B), and a liquid-al- cohol (Part C). INTRODUCTION In this experiment the specific gravity of several substances will be determined by ap- plying Archimedes principle.
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