1.Thermal expansion: The expansion of matter when its temperature is raised.








Pressure: The force on each unit of area of a surface.







3.Melting: The change of a solid into a liquid.











4.Vaporization: The change of a liquid to a gas as molecules break free from each other.







5.Condensation: The change of a gas to a liquid as molecules break free from each other.







6.Freezing: The change of a liquid into a solid.







7. Boiling: The formation of bubbles of vapor that escape from a liquid that is being heated.











8. Evaporation: The vaporization of molecules from the surface of a liquid.