Vocabulary 5

thermal expansion: the expansion of matter when its temperature is raised.

pressure: the force on each unit of area of a surface.

melting: the change of a solid into a liquid.

vaporization: the change of a liquid to a gas as molecule break free from each other.

condensation: the change of a gas into a liquid as molecules attract each other.

freezing: the change of a liquid into a solid.

boiling: the formation of bubbles of vapor that escape from a liquid that is being heated.

evaporation: the vaporization of molecules from the surface of a liquid.