Distillation makes a purify of compound by difference for vapor pressure of substance.When the liquid has been heated, the heat will destroy the gravity between molecule. The vapor pressure happened to cause called vapor pressure. When the pressure of the liquid equals atmospheric pressure above the liquid to the boil. Typically measuring boiling point is measured when the liquid has a vapor pressure of 1 atmosphere. This is called the normal boiling point. In addition to separate liquids from distillation to separate the solids from solids.The liquid boiling point than be distilled to separate. The liquid is boiling vaporize and separate vapor condenses back into a liquid container another one.