Phase(Britannica)1 S.J.T.U. Phase Transformation and Applications Page 14/45 in thermodynamics,chemically and physically uniform or homogeneous quantity of matter that can be separated mechanically from a nonhomogeneous mixture and that may consist of a single substance or of a mixture of substances.The three fundamental phases of matter are solid,liquid,and gas (vapour),but others are considered to exist,including crystalline,glassy,amorphous,and plasma phases SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 13 Phase RulePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 13 Phase Rule Page 14/45 Phase (Britannica) 1 in thermodynamics, chemically and physically uniform or homogeneous quantity of matter that can be separated mechanically from a nonhomogeneous mixture and that may consist of a single substance or of a mixture of substances. The three fundamental phases of matter are solid, liquid, and gas (vapour), but others are considered to exist, including crystalline, glassy, amorphous, and plasma phases