Question

The SI unit of specific heat capacity is:

• A. $Jk{g}^{-1}$
• B. $J{K}^{-1}$
• C. $Jk{g}^{-1}{K}^{-1}$
• D. $kJk{g}^{-1}{K}^{-1}$

Answer 1

The correct option is C

$Jk{g}^{-1}{K}^{-1}$

Explanation for the correct option

(c) $Jk{g}^{-1}{K}^{-1}$

Unit of specific heat capacity

• The specific heat capacity is the amount of heat energy required to raise the temperature of a unit mass of a substance by unit degree.
• In the SI system, the unit of specific heat capacity is$Jk{g}^{-1}{K}^{-1}$.

---

Explanation for the incorrect option

(a) $Jk{g}^{-1}$

Joule per kilogram is the SI unit of thermal heat capacity.

(b)$J{K}^{-1}$

Joule per kelvin is the SI unit of entropy.

(d) $kJk{g}^{-1}{K}^{-1}$

The kilojoule per kilogram per kelvin is the unit of specific heat capacity which is the multiple of SI unit of specific heat capacity.

---

Thus, the SI unit of specific heat capacity is$Jk{g}^{-1}{K}^{-1}$. Hence, the correct answer is an option (c).