It is the passage of a substance from the liquid state to the gaseous state by the absorption of heat or the drop of pressure to which this substance is subjected. According to the way of processing, the vaporization receives different names: Evaporation, Boiling and Heating.
Evaporation: It is the passage of a substance from the liquid state to the gaseous state by a slow process that occurs only on the surface of the liquid. Evaporation may occur at any temperature at which the liquid is present.
Boiling: It is the passage of a substance from the liquid state to the gaseous state through a tumultuous process, which occurs throughout the liquid mass. Boiling occurs at a certain temperature, called boiling temperature. This varies according to the pressure.
Heating: It is the passage of a substance from the liquid to the gaseous state by a rapid process, at a temperature above its boiling temperature. This is the case, for example, when throwing water on a well-heated stove plate.
