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Ehrenfest equations : ウィキペディア英語版 | Ehrenfest equations Ehrenfest equations — equations which describe changes in specific heat capacity and derivatives of specific volume in second-order phase transitions. '' Clausius–Clapeyron relation does not make sense for second-order phase transitions'',〔Sivuhin D.V. General physics course. V.2. Thermodynamics and molecular physics. 2005〕 as both specific heat capacity and specific volume do not change in second-order phase transitions. ==Quantitative consideration== Ehrenfest equations are the consequence of continuity of specific entropy and specific volume , which are first derivatives of specific Gibbs free energy - in second-order phase transitions. If we consider specific entropy as a function of temperature and pressure, then its differential is: . As
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