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 Fall 2010 X.J.Jin Lecture 13 Phase RulePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 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