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Topic: Gibbs energy at triple point  (Read 2714 times)

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Offline Bakhtiyar

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Gibbs energy at triple point
« on: December 29, 2014, 08:20:11 AM »
At the triple point on phase diagram, all phase boundaries disappear. I want to know about Gibbs energy . G=0 at triple point ?
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Offline mjc123

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Re: Gibbs energy at triple point
« Reply #1 on: December 31, 2014, 12:27:59 PM »
At the triple point Gsolid = Gliquid = Gvapour. ΔG is 0 for any of the phase transitions, but G itself is not 0.
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Offline unsu

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Re: Gibbs energy at triple point
« Reply #2 on: December 31, 2014, 01:00:00 PM »
At the triple point all three phases are at equilibrium, for the phase transitions ΔG = 0.
The chemical potentials for solid, liquid and gas are equal.
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