High Quality Content by WIKIPEDIA articles! Vaporization of an element or compound is a phase transition from the liquid or solid phase to gas phase. There are three types of vaporization: evaporation, boiling and sublimationEvaporation is a phase transition from the liquid phase to gas phase that occurs at temperatures below the boiling temperature at a given pressure. Note: evaporation usually occurs on the surface.Boiling is a phase transition from the liquid phase to gas phase that occurs at or above the temperature the boiling temperature. Note boiling occurs below the surface.