(a) Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.
(b) Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?

(a) Deposition is the term used to denote the conversion of vapour to solid.

(b) The amount of heat energy released or absorbed when a solid change to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.