Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, $$\rho $$ = Density of substance, S = Specific heat and k = Thermal conductivity)

A. $${\text{h}} = \frac{{\text{k}}}{{\rho {\text{S}}}}$$

B. $${\text{h}} = \frac{{\rho {\text{S}}}}{{\text{k}}}$$

C. $${\text{h}} = \frac{{\text{S}}}{{\rho {\text{k}}}}$$

D. $${\text{h}} = \frac{{\rho {\text{k}}}}{{\text{S}}}$$

Answer: Option A

Solution(By Examveda Team)

Thermal Diffusivity is defined as the ratio of heat conducted to the heat energy stored per unit volume of a material.
The thermal conductivity of a substance divided by the product of its density and its specific heat capacity.
Thermal diffusivity of a substance is given by $${\text{h}} = \frac{{\text{k}}}{{\rho {\text{S}}}}$$
(Where h = Thermal diffusivity, $$\rho $$ = Density of substance, S = Specific heat and k = Thermal conductivity)