Question

difference between latin heat of fusion and latin heat of vapour present in air

Answer 1

In latent heat of fusion object takes latent heat and change from solid into liquid .
whereas
In latent heat of vaporisation object takes latent heat and change from liquid to gas.

Answer 2

Latent heat of fusion:

The amount of heat energy required to change 1 kilogram of a solid to liquid at its melting point and at atmospheric pressure.

Example: The latent heat of fusion for water (ice) is 334 kJ/mol (approx.)

Latent heat of vaporization:

The amount of heat energy required to change 1 kilogram of a liquid to gas at its boiling point and at atmospheric pressure.

Example: The latent heat of vaporization of water is 40.8 kJ/mol (approx.)

Hope it helps :)