1.14 Joule-Thomson Coefficient S.J.T.U. Phase Transformation and Applications Joule-Thomson Coefficient defined as the change of temperature with pressure at constant enthalpy. at System boundary H δm δmo 温度计 77777 Adiabatic process SJTU Thermodynamics of Materials Fall 2012 ©X.J.Jin Lecture 2 First Law llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2012 © X. J. Jin Lecture 2 First Law II 1.14 Joule-Thomson Coefficient Joule-Thomson Coefficient : defined as the change of temperature with pressure at constant enthalpy. System boundary mi mo H JT P T           Adiabatic process