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Question

# (a) Define density. What is the SI unit of density? (b) Define relative density. What s the SI unit of relative density?

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Solution

## (a) The density of a body is defined as the mass per unit volume of the body. $\mathrm{Density}=\frac{\mathrm{Mass}\mathrm{of}\mathrm{the}\mathrm{body}}{\mathrm{Volume}\mathrm{of}\mathrm{the}\mathrm{body}}$ The SI unit of the density is kg/m3 (b) The density of a body relative to the density of the water is known as the relative density of the body. It is basically the ratio of the density of a body to the density of water. $\mathrm{Relative}\mathrm{density}=\frac{\mathrm{Density}\mathrm{of}\mathrm{the}\mathrm{body}}{\mathrm{Density}\mathrm{of}\mathrm{the}\mathrm{Water}}$ Relative density is a unitless quantity, as it is given by the ratio of densities.

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