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Chemical Engineering Basics

Q1:

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

A 1/k

B k

C k2

D 1/k2

ANS:B - k

Thermal diffusivity (α) is defined as the ratio of thermal conductivity (k) to the product of density (ρ) and specific heat capacity (Cp​) of a substance. It is represented by the equation: α=ρCp​k​ Given that thermal conductivity (k) is already known, we can see that thermal diffusivity is inversely proportional to ρ and Cp​. Therefore, the correct answer is: 1/k​​ So, thermal diffusivity is proportional to 1/k​.



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