Boiling Point Definition

Definition of Boiling Point in Chemistry

This is boiling water. The temperature of the water may be at its boiling point or above it.
This is boiling water. The temperature of the water may be at its boiling point or above it. David Murray and Jules Selmes / Getty Images

Boiling Point Definition

The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. Therefore, the boiling point of a liquid depends on atmospheric pressure. The boiling point becomes lower as the external pressure is reduced.