Question

The SI unit of specific latent heat is

• A. cal g${}^{-1}$
• B. cal g${}^{-1}$ K${}^{-1}$
• C. J kg${}^{-1}$
• D. J kg${}^{-1}$ K${}^{-1}$

Answer 1

The correct option is C J kg${}^{-1}$

The specific latent heat of a substance is the quantity of heat energy required to change the state of a unit mass of a substance. $E_L=ml$ where $E_L$ is the heat transferred, in joules, $m$ is the mass, in kilograms, and $l$ is the latent heat in joules per kilogram. The SI unit for specific latent heat is $J{kg}^{-1}$.