Thermal diffusivity of a substance is
A)directly proportional to thermal con¬ductivity
B)inversely proportional to density of substance
C)inversely proportional to specific heat
D)all of the above
E)none of the above.

Question

Quizplus · Accepted Answer

Thermal diffusivity is a measure of how quickly a material can conduct thermal energy relative to its ability to store thermal energy. It is defined as the thermal conductivity divided by the product of density and specific heat capacity at constant pressure. Therefore, it is directly proportional to thermal conductivity and inversely proportional to both the density of the substance and its specific heat, making all of the given statements correct.

Thermal Diffusivity of a Substance Is