Translations:Adventist Youth Honors Answer Book/Health and Science/Chemistry/51/en
From Pathfinder Wiki
The states of matter are largely defined based on the level of interaction between the molecules and atoms that form the matter. This interaction is temperature (and pressure) dependent, and there are well defined freezing (liquid to solid) points, melting(solid to liquid) points, boiling (liquid to gas) points, condensation( gas to liquid) points, for each element or molecule at a particular air pressure(i.e. normal sea level pressure).
