phase change

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WordNet Dictionary
	Definition:		[n]  a change from one state (solid or liquid or gas) to another without a change in chemical composition
	Synonyms:		phase transition, physical change, state change
	See Also:		action, activity, evaporation, freeze, freezing, liquefaction, melt, melting, natural action, natural process, thaw, thawing, vapor, vaporisation, vaporization, vapour