While studying thermodynamics I came across the Gibbs free energy and the Helmholtz free energy... IF I understand thing correctly, when describing a phase transition I can use any thermodynamical potential I want, or "the one that suits me best". But what I don't understand is, if I use a random potential, to describe the phase transition, how will others, know which TP I used? And can I even randomly create a TP that suits me best?
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