Heat capacity:

             The heat capacity of a body is the quantity of thermal energy absorbed by it for one Kelvin (1K) increase in its temperature.
             If the temperature of a body increases through $\triangle T$ on adding $\triangle Q$ amount of heat, then its heat capacity will be $\frac{\triangle Q}{(\triangle T)}$. Putting the value of $\triangle Q$.

We get: 

            Heat capacity =      $\triangle Q/(\triangle T )$   =  $ \frac{mc\triangle T}{(\triangle T )}$
            Heat capacity =     mc …………   (i)

Equation (i) shows that the heat capacity of a body is equal to the product of the mass of the body and its specific heat capacity.

           For example, the heat capacity of 5kg of water is (5 kg \times 4200 Jkg^{-1} K^{-1}) 21000 JK^{-1}. That is; 5kg of water needs 21000 joules of heat for every 1 K rise in its temperature. Thus, the larger the quantity of a substance, the larger will be its heat capacity.