Definition of Gibbs​ Free Energy

Gibbs​ Free Energy is the thermodynamic potential which is used to determine the maximum of work that can be done by a thermodynamic system when the temperature and pressure of the system are kept constant. The heat and work done can be exchanged with the surroundings but not with any matter. This is measured in the units of joules according to System International.


The maximum of work done can be attained only through the reversible process. Normally, Gibbs free energy is known to be the energy that is freely available to a system. The equation to calculate this energy can be determined by the formula given under if the reactants and products are in their thermodynamic states: 

ΔGo​ ​ = ΔHo​ ​ – TΔSo​

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