First-Order Phase Transformation at Constant Volume: A Continuous Transition?

@article{Correa2021FirstOrderPT,
  title={First-Order Phase Transformation at Constant Volume: A Continuous Transition?},
  author={V{\'i}ctor F. Correa and Facundo J. Castro},
  journal={Entropy},
  year={2021},
  volume={24}
}
We describe a first-order phase transition of a simple system in a process where the volume is kept constant. We show that, unlike what happens when the pressure is constant, (i) the transformation extends over a finite temperature (and pressure) range, (ii) each and every extensive potential (internal energy U, enthalpy H, Helmholtz energy F, and Gibbs energy G), and the entropy S is continuous across the transition, and (iii) the constant-volume heat capacity does not diverge during the… 

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