The process of separating liquids through differences in their vapor pressures is called  In the oldest method, the concentration of alcohol by the application of heat we get the fermented liquid mixture. Now this method is energy-consuming used for the production of petroleum products in chemical industry and other fields. The chemical properties of the mixture are determined by the composition of vapor during liquid mixture evaporation.

 Distillation is possible only when the component having higher vapor proportion than the mixture. With other components, the given component having a higher vapor pressure and a low boiling point.