# Tag Info

## New answers tagged phase-transition

1

Addressing parts of the question out of order: ...the heat capacity would smoothly approach zero around the transition. I have never seen anyone refer to these types of transition... The heat capacity of all substances smoothly approaches zero at absolute zero. $S(E)$ has a segment of zero first derivative no, the first derivative is a constant, ...

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Given a phase transition $\phi$ between two phase $\alpha$ and $\beta$: $$X_{(\alpha)} \rightleftharpoons X_{(\beta)}$$ When such transformation occurs at a constant Temperature $T_\phi$ there is an equilibrium between the two phases, thus you can write the following equality:  \Delta_\mathrm{\phi}G = \Delta_\mathrm{\phi}H - T_\phi\Delta_\mathrm{\phi}S ...

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As far as I remember, enthropy is also a state variable of a material. When it comes to other state variables, if You assume the constant temperature of the phase transition, it should be followed by a constant pressure. Volume, internal energy, enthalpy and enthropy change. For example during evaporation of water all of them increase.

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