Entropy as a State Function(3) S.J.T.0. Phase Transformation and Applications -))= i〔婴)-婴-i婴) 这一积分的数值与积分的途径无关，代表着某个状 态的改变量，定义为熵 For a close system the reversible heat flow divided by the absolute temperature of the system is a state or point function. SJTU Thermodynamics of Materials Fall 2012 X.J.Jin Lecture 4 Second law llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2012 © X. J. Jin Lecture 4 Second law II Entropy as a State Function(3) ⎟ = 0 ⎠⎞ ⎜⎝⎛ ⎟ + ⎠⎞ ⎜⎝⎛ = ∫ ∫ ∫ α β δ δ δ AB r BA r r TQ TQ TQ α β β δ δ δ ∫ ∫ ∫ ⎟⎠⎞ ⎜⎝⎛ ⎟ = ⎠⎞ ⎜⎝⎛ ⎟ = − ⎠⎞ ⎜⎝⎛ BA r AB r BA r TQ TQ TQ P V A B α β 这一积分的数值与积分的途径无关，代表着某个状 态的改变量，定义为熵 For a close system the reversible heat flow divided by the absolute temperature of the system is a state or point function