Health / Medical Topics |
Standard Gibbs Free Energy Change
A measure of the spontaneity of a chemical reaction. It is the change in the free energy of a system during a chemical reaction at a pH of 7.0. It is equal to the change in the enthalpy of the system minus the change in the product of the temperature times the entropy of the system. The resulting sign of Delta G determines if a reaction is spontaneous or not: DG < 0 indicates that the reaction is spontaneous; DG > 0 indicates that the reaction is not spontaneous; and DG = 0 indicates that the reaction is at equilibrium. (NCI Thesaurus)
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