Question

defin heat of fusion and vapourisation
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Answer 1

The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. ... The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.

Answer 2

#Heat of fusion : It is the quantity of heat necessary to change 1g of solid to liquid without any change in temperature.

#Heat of vaporisation :

Because the molecules of a liquid are in constant motion and possess a wide range of kinetic energies, at any moment some fraction of them has enough energy to escape from the surface of the liquid to enter the gas or vapor phase. This process, called vaporization It is also termed as latent heat of vaporisation..