Phase Changes

Vaporization of a sample of liquid is a phase transition from the liquid phase to the gas phase.

A supercritical fluid is a substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist.

Freezing is a phase transition in which a liquid turns into a solid when its temperature is lowered to its freezing point.

Sublimation is the phase transition from the solid to the gaseous phase, without passing through an intermediate liquid phase.

Water transitions from ice to liquid to water vapor as heat is added to it.