What is the temperature at which a substance changes from a liquid to a gas called?

The temperature at which a substance changes from a liquid to a gas is known as the boiling point. At this specific temperature, the vapor pressure of the liquid equals the external pressure surrounding the liquid, allowing it to overcome intermolecular forces and transition into the gas phase.

In contrast, the melting point is when a solid turns into a liquid, while the freezing point refers to the temperature at which a liquid becomes a solid. The condensation point is related to the phase transition from gas to liquid and does not pertain to the conversion from liquid to gas. Understanding these definitions clarifies the significance of the boiling point in phase changes of matter.