Question

The conduction heat diffuses in a material when the material has:

1) High thermal conductivity

2) Low density

3) High specific heat

4) High viscosity

Which of the above are correct?
1. 1 and 2
2. 2 and 3
3. 3 and 4
4. 4 and 1

Answer 1

Correct Answer - Option 1 : 1 and 2

Explanation:

Conduction is a microscopic phenomenon occurs in stationary medium. It occurs in all states of matter (solid, liquid and gas). In solid it is to lattice vibration and flow of electron whereas in liquid and gas, it is due to molecular collision.

Thermal diffusivity of material is given as, \(\alpha = \frac{k}{{\rho c}}\). It is the property of a material.

Larger the value of α, faster heat will diffuse through the material. It means less heat will be stored and more conduction will occur.

A high value of α could result either from a high value of thermal conductivity or low value of thermal heat capacity ρ_c or less density material.

Thermal diffusivity α has units of square meters per second (m2/s).