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In the equation dG = A*dᵞ+ ᵞ*dA, if dᵞ = 0, what does that mean? (ᵞ is the interfacial free energy, A is the area of interface).

In the equation dG = A*dᵞ+ ᵞ*dA, if dᵞ = 0, what does that mean? (ᵞ is the interfacial free energy, A is the area of interface). Correct Answer The interfacial excess free energy is same as surface tension

If dᵞ = 0, the change in free energy is equal to the work done in increasing the interface area; and, hence, the interfacial free energy is the same as surface tension. On the other hand, in general, in solids, the surface tension is not the same as the interfacial free energy.

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