Phase change

Phase change is the process of a substance moving from one of four states to another. The four states are solid, liquid, gas, and plasma, though plasma is uncommon on Earth on not discussed in this article. Although it may take extreme temperature, pressure, or energy, all substances can be changed.

Six Distinct Phase Changes

Name	From	Into
Freezing	Liquid	Solid
Melting	Solid	Liquid
Condensation	Gas	Liquid
Vaporization	Liquid	Gas
Sublimation	Solid	Gas
Deposition	Gas	Solid
Ionization	Gas	Plasma
Recombination	Plasma	Gas

Air conditioners and mini-split systems use phase change properties for heating and cooling.

Links

• https://study.com/academy/lesson/phase-change-evaporation-condensation-freezing-melting.html
• https://en.wikipedia.org/wiki/Enthalpy_of_vaporization
• http://www.evanstempcon.com/pdf/Air_Conditioning_Theory.pdf