First order transitions:variation of equilibrium S.J.T.U. pressure with temperature(3) Phase Transformation and Applications Vapor pressure curve/phase equilibrium line The values on this curve represent the pressure of water vapor in equilibrium with pure liquid water at the same pressure at the specified temperature dG=-SdTg+vadp dGB=-SpdTg+VBdp dG=dG=-SdTg+vadp=-SBdTeg+vBdp Sg-SA)dT四=yB-VAdp9 △SdTe9=AVdp9 SJTU Thermodynamics of Materials Spring2006©X.J.Jin Lecture 7 equilibrium IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2006 © X. J. Jin Lecture 7 equilibrium I First order transitions: variation of equilibrium pressure with temperature (3) eq A eq A A +−= dpVdTSdG Vapor pressure curve / phase equilibrium line The values on this curve represent the pressure of water vapor in equilibrium with pure liquid water at the same pressure at the specified temperature eq B eq B B +−= dpVdTSdG eq B eq B eq A eq A A A +−=+−== dpVdTSdpVdTSdGdG ( ) ( ) eq AB eq AB −=− dpVVdTSS eq eq Δ=Δ dpVdTS