恒温下熵变的计算(1) S.J.T.0. Phase Transformation and Applications p.65,2.13 s:-s.-fds--(r)dp EX:ideal gas PV=RT R-P ds=- 恒温下，当压力改变时，将引起熵变 For a change in pressure from 1 atm to 10 atm at constant temperature -019.4J/(mol-K) U SJTU Thermodynamics of Materials Spring2008©X.J.Jin Lecture 6 Property Relation IlPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 6 Property Relation II 恒温下熵变的计算(1) T T P V P S                   21 21 2 1 PP P dP TV S S d S EX: ideal gas dP P R d S P R P S P R T V PV RT P T               For a change in pressure from 1 atm to 10 atm at constant temperature R P R J   mol K PdP S RPP            ln ln10 19.14 / 101 21 恒温下，当压力改变时，将引起熵变 p.65, 2.13