Question

The S.I. unit of thermal diffusivity is ___________

(a) m/s

(b) m^2/s

(c) m/s^2

(d) m^2/s^2

The question was posed to me during an online interview.

I need to ask this question from Role of Diffusion in Bioprocessing topic in section Mass Transfer of Bioprocess Engineering

Answer 1

The correct answer is (b) m^2/s

Explanation: The units of thermal diffusivity are length^2/time and a common set of SI units is m^2/sec (the use of cm or mm as the length scale is frequent as it allows reporting of values closer to the value one).