1.15 Equations of State (7) S.J.T.U. Phase Transformation and Applications Approximations of the heat capacity of elemental gases at low pressure A monatomic ideal gas A diatomic ideal gas Cr= 3 5 R 2 Ci= R 7 -R R 2 2 N2Cp=27.87+298×4.27×103=29.14J/(mol.K) 实验 7 Cp=。R=29.1J(molK) 理论 2 02 Cp=29.32J/(mol·K) SJTU Thermodynamics of Materials Spring 2006 X.J.Jin Lecture 2 First Law llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2006 © X. J. Jin Lecture 2 First Law II 1.15 Equations of State (7) RC RC P V 2 5 2 3 = = A monatomic ideal gas Approximations of the heat capacity of elemental gases at low pressure A diatomic ideal gas RC RC P V 2 7 2 5 = = N2 )/(14.291027.429887.27 3 C KmolJ P =××+= ⋅ − )/(1.29 27 P == ⋅KmolJRC O2 CP = ⋅KmolJ )/(32.29 实验 理论