1.15 Equations of State (3) S.J.T.U. Phase Transformation and Applications Joule-Thomson coefficient for an ideal gas. aH OT nst T = =0 6H OT )p SJTU Thermodynamics of Materials Spring2006©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 (3) Joule-Thomson coefficient for an ideal gas. ⎟ = 0 ⎠⎞ ⎜⎝⎛ ∂∂P T H = 0 ⎟⎠⎞ ⎜⎝⎛ ∂∂ ⎟⎠⎞ ⎜⎝⎛ ∂∂ ⎟ −= ⎠⎞ ⎜⎝⎛ ∂∂ = PT H JT THPH PT η