Question

What is the Latin heat of fusion and latent heat of vaporization

Answer 1

Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.
 Latent heat of vaporization is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.

Answer 2

The amount of heat energy required to convert 1kg of solid into liquid at its melting point is known as LATENT HEAT OF FUSION.
The amount of heat energy required to convert 1kg of liquid into vapour at its melting point is known as LATENT HEAT OF VAPORIZATION.