1.15 Equations of State (1) S.J.T.U. Phase Transformation and Applications Equations of state the relationship among the physical variables that describe the condition of a material. For gases the relationship between pressure(P),volume (V), temperature (T)and number of moles(n). PV =nRT PV-RT R:the universal gas constant:8.314 J/(mol.K) One mole of gas at 273.15 K and one atmosphere V=22.4L/mo1 状态方程 理想气体的状态方程 SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 2 First Law llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 2 First Law II 1.15 Equations of State (1) Equations of state : the relationship among the physical variables that describe the condition of a material. For gases : the relationship between pressure (P), volume (V), temperature (T) and number of moles (n). PV  nRT PV  RT R : the universal gas constant: 8.314 J/(molK). V  2 2.4L/ mol One mole of gas at 273.15 K and one atmosphere 状态方程 理想气体的状态方程