Heat of evaporation

The energy required to transform a given quantity of a substance from a liquid into a gas at a given pressure (often atmospheric pressure).

Sublimation

When a substance makes a transition from the solid state to the gas state directly without going through the liquid state.

Fusion

Process of a substance undergoing a phase transition from a solid into a liquid.

Vapor Pressure

The pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system.

Deposition

A process in which gas transforms into solid.

Specific Heat

The measurable physical quantity that shows the amount of heat required to change a substance's temperature by a given amount.