Question

______ is the ability of a material to transmit a thermal disturbance.

(a) Specific heat

(b) Thermal diffusivity

(c) Entropy

(d) Latent heat

The question was posed to me in an interview for job.

My question is based upon Heat Transfer Applications topic in section Heat Transfer Applications of Food Processing Unit Operations

Answer 1

Correct choice is (b) Thermal diffusivity

To elaborate: Thermal diffusivity is the ability of a material to transmit a thermal disturbance. It determines heat propagation and diffusion through a material. It helps in estimating the process time of canning, cooking and cooling. Water content, composition, temperature and porosity affect thermal diffusivity.