Phase(Britannica)2 S.J.T.U. Phase Transformation and Applications Page 15/45 Matter is considered to form one homogeneous phase if its atomic or molecular dispersion is uniform;e.g.,a glass of water containing dissolved salt,sugar,and a dye constitutes only a single liquid phase.If hundreds of grains of sand were added,all the grains together would constitute only a single additional (solid)phase The different phases of a pure substance bear a fixed relationship to one another in terms of temperature and pressure.Thus,if the pressure on some liquids is raised,they will freeze at a higher temperature.This relationship is extremely important in industrial as well as scientific work. SJTU Thermodynamics of Materials Spring2010©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 15/45 Phase (Britannica) 2 Matter is considered to form one homogeneous phase if its atomic or molecular dispersion is uniform; e.g., a glass of water containing dissolved salt, sugar, and a dye constitutes only a single liquid phase. If hundreds of grains of sand were added, all the grains together would constitute only a single additional (solid) phase. The different phases of a pure substance bear a fixed relationship to one another in terms of temperature and pressure. Thus, if the pressure on some liquids is raised, they will freeze at a higher temperature. This relationship is extremely important in industrial as well as scientific work