Question

Which of the following is the correct unit for heat capacity?

• A. ${\text{JK}}^{-1}{\text{kg}}^{-1}$
• B. ${\text{JK}}^{-1}$
• C. ${\text{Jkg}}^{-1}{{}^{\circ }\text{C}}^{-1}$
• D. ${\text{JK}}^{-1}{\text{kg}}^{-1}$

Answer 1

The correct option is B ${\text{JK}}^{-1}$

We know that,
Heat capacity $=ms$
where $s$ is specific heat capacity
& $m$ is the mass of the substance.
Now, heat lost or gained is given by,
$Q=ms\Delta T$
$\Rightarrow ms=\frac{Q\text{(J)}}{\Delta T\text{(K)}}$
$\therefore$ we can say that,
unit of heat capacity $=\text{J/K}$
Thus, option (b) is the correct answer.