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Vaporization (or vaporisation) of an element or compound is a phase transition from the liquid phase to vapour. There are two types of vaporization: Evaporation and Boiling.

Evaporation is a phase transition from the liquid phase to vapour phase that occurs at temperatures below the boiling temperature at a given pressure. Evaporation usually occurs on the surface. 

Boiling is a phase transition from the liquid phase to gas phase that occurs at or above the boiling temperature. Boiling is opposed to evaporation, occurs below the surface.