Define two specific heats of a gas. Write the relation between them.

(N/A) For gases,the specific heat capacity is defined as the molar specific heat capacity.
$1$. Molar specific heat capacity at constant volume $(C_{V})$: It is the amount of heat required to raise the temperature of $1$ mole of a gas by $1 \ K$ (or $1^{\circ}C$) while keeping the volume constant.
$2$. Molar specific heat capacity at constant pressure $(C_{P})$: It is the amount of heat required to raise the temperature of $1$ mole of a gas by $1 \ K$ (or $1^{\circ}C$) while keeping the pressure constant.
The relation between these two molar specific heat capacities is given by Mayer's relation: $C_{P} - C_{V} = R$,where $R$ is the universal gas constant.