Fusion: It is the process that powers the sun and the stars or the combustion of any two matters.
Vapourisation: Itis conversion of a substance from liquid or solid state to gas state.
Condensation: It is known as the conversation of a substance from gas or vapour to liquid state.
Solidification: It is the conversation of a substance from liquid state to solid state.
Sublimation: It is the conversation of a substance from solid state to gas state directly without passing through a liquid state.