Why is Gibbs free energy 0 at phase change?

1 Answer
Aritra G. · Truong-Son N.
Jun 6, 2017

The Gibbs free energy is not necessarily zero at a phase change.

However, since the Gibbs function depends naturally on the Thermodynamic variables #p# and #T# and since common phase transitions occurs at a constant #p# and #T#, thus, the molar/specific Gibbs function tends to be a constant during the phase change.

Thus, change in the Gibbs function is zero, i.e. #dG = 0# even though the molar/specific Gibbs function is non zero.

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