Friday, November 18, 2011

Why is Gibbs free energy zero for phase changes at constant temperature and pressure?

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Question by : Why is Gibbs cost-free energy zero for phase changes at constant temperature and pressure?
I get that ΔG measures the spontaneity/capacity of a technique to do non-mechanical function, and that if
ΔG > , the reaction is not spontaneous
ΔG < 0, the reaction is spontaneous
ΔG = 0, the reaction is at equilibrium

but what exactly does equilibrium mean?
So why is Gibbs free energy zero for phase changes at constant temperature and

Tesla's Generator

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