The purity of gold can be tested by weighing it in air and in water. How? Do you think you could get away with making a fake gold brick by gold-plating some cheaper material?
Solution to 11DQ Step 1of 1 Introduction Relative density is the ratio of the density of a substance to that of the density of a reference fluid. Generally we take water as the standard fluid. Every substance has 0 a standard specific gravity or relative density with respect to water at 4 C. Purity of gold is tested by weighing it in air and then while it being submerged in water.