 Boiling-point elevation

Raising a solvent's boiling point at fixed external pressure by a dissolved nonvolatile solute, under conditions where the solvent vapour pressure is reduced. The simple rule does not apply unchanged to every mixture of volatile components.

Boiling-point elevation is a colligative property of solutions that describes the phenomenon where the boiling point of a solvent increases when a non-volatile solute is dissolved in it. This occurs because the presence of solute particles interferes with the ability of solvent molecules to escape into the vapor phase, which is necessary for boiling to occur.