Define the following terms:

(a) Fusion

(b) Vaporisation

(c) Condensation

(d) Sublimation

(e) Diffusion

(f) Melting point

(g) Boiling point

(h) Liquefaction

(i) Evaporation

(a) The process by which a substance changes from solid state to liquid state is called melting or fusion.

(b) The process by which a substance changes from a liquid state to vapour state on heating is called vaporisation or boiling.

(c) The process by which a substance in gaseous state changes into its liquid state is called condensation or liquefaction.

(d) The conversion of a solid substance into its vapour without undergoing liquid state on heating is called sublimation.

(e) The phenomenon of intermixing of particles of one kind with another kind is called diffusion.

(f) The fixed temperature at which a solid changes into a liquid at a given pressure is called its melting point.

(g) The fixed temperature at which a liquid starts changing into gaseous state is called its boiling point.

(h) The process by which a substance in gaseous state changes into its liquid state is called condensation or liquefaction.

(i) The change of state of a liquid into vapour below boiling point is called as evaporation.