Define specific heat capacity and write its $SI$ unit.

(N/A) Specific heat capacity of a substance is defined as the amount of heat energy required to raise the temperature of a unit mass of the substance by $1 \ K$ (or $1 \ ^\circ C$).
Mathematically,it is given by $s = \frac{Q}{m \Delta T}$,where $Q$ is the heat energy,$m$ is the mass,and $\Delta T$ is the change in temperature.
The $SI$ unit of specific heat capacity is $\text{Joule per kilogram per Kelvin}$ $(J \ kg^{-1} \ K^{-1})$.