The mass of a body is 2.5 kg, and its volume is 250 cm³. Find its relative density:

Given mass of the body = 2.5 kg = 2500 g

Volume of the body = 250 cm³

∴ The density of the body = $=\frac{\text{ mass }}{\text{ volume }}=\frac{2500 \mathrm{g}}{250{ \mathrm{cm}}^3}=10{\mathrm{gcm}}^{-3}$

The density of water = 1 g/cm³

∴ The relative density of the body is: 
 $\frac{\text{ Density of the Body }}{\text{ Density of water }}=\frac{10}{1}=10$