The density of water is 1000kg/m3. The density of water vapour at 100°C and 2 atmospheric pressure is 0.6kg m3. The volume of a molecule multiplied by the total number gives what is called, molecular volume. Estimate the ratio (or fraction) of the molecular volume to the total volume occupied by the water vapour under the above conditions of temperature and pressure.
Volume of m kg of molecules = m/1000
Volume occupied by water vapour = m/0.6
Note: Here water is assumed to be completely compact. Therefore, by using density of water we calculate molecular volume.
