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Definition of Spontaneous reaction

Spontaneous reaction Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A spontaneous process is the time-evolution of a system in which it releases free energy (usually as heat) and moves to a lower, more thermodynamically stable energy state. The sign convention of changes in free energy follows the general convention for thermodynamic measurements, in which a release of free energy from the system corresponds to a negative change in free energy, but a positive change for the surroundings.

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