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In [[thermodynamics]], a '''phase transition''' is the transformation of a thermodynamic system from one [[phase]] to another.  At phase-transition point, physical properties may undergo abrupt change- for instance, volume of the two phases may be vastly different.  As an example imagine transition of liquid water into vapour at boiling point.   

In [[thermodynamics]], a '''phase transition''' is the transformation of a thermodynamic system from one [[phase]] to another.  At phase-transition point, physical properties may undergo abrupt change- for instance, volume of the two phases may be vastly different.  As an example imagine transition of liquid water into vapour at boiling point.