Question

.Differtiate between the following : (a) Conduction and convection (b) Expansion and contraction

Answer 1

Explanation:

Conduction :

1} It is the transfer of heat by direct contact.

2) The reason for heat transfer is temperature difference.

Convention:

1) It involves the heat movement by actual motion of the matter.

2) This process takes place due to difference in densities.

Answer 2

in conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles.