OBJECT: To determine the densities of a solid and a liquid by using Archimedes’ principle and a Jolly balance.
METHOD: A body is alternately weighed suspended in air and immersed in a liquid. The apparent loss in weight of the immersed body is known, by Archimedes’ principle, to equal the weight of liquid displaced by the body. The apparent less in weight is measured by means of a spring. From these measurements the density and specific gravity of either the solid body or the liquid may be determined.
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