ΔG
Definition
ΔG, or the change in Gibbs free energy, is a measure of the spontaneity and overall energy change of a chemical reaction. It indicates whether a reaction is exergonic (favorable, ΔG < 0) or endergonic (unfavorable, ΔG > 0).
Analogy
Think of ΔG as the balance between money spent and money earned in a business. If you have more money earned than spent (ΔG < 0), your business is profitable and spontaneous. But if you have more money spent than earned (ΔG > 0), your business is not sustainable.
Related terms
Activation Energy: The minimum amount of energy required for a chemical reaction to occur.
Exergonic Reaction: A reaction that releases energy to its surroundings.
Endergonic Reaction: A reaction that absorbs energy from its surroundings.
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