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An exergonic process is one which there is a positive flow of energy from the system to the surroundings. This is in contrast with an endergonic process. Constant pressure, constant temperature reactions are exergonic if and only if the Gibbs free energy change is negative (?G < 0). "Exergonic" (from the prefix exo-, derived for the Greek word ??? exo, "outside" and the suffix -ergonic, derived from the Greek word ????? ergon, "work") means "releasing energy in the form of work". In thermodynamics, work is defined as the energy moving from the system (the internal region) to the surroundings (the external region) during a given process.

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