In chemical thermodynamics, an endergonic reaction (also called a nonspontaneous reaction or an unfavorable reaction) is a chemical reaction in which the standard change in free energy is positive, and energy is absorbed. In layman's terms the total amount of energy is a loss (it takes more energy to start the reaction than what you get out of it) so the total energy is a negative net result. For an overall gain in the net result see Exergonic Reaction.
Under constant temperature and constant pressure conditions, this means that the change in the standard Gibbs free energy would be positive
for the reaction at standard state (i.e. at standard pressure (1 bar), and standard concentrations (1 molar) of all the reagents).
Read more about Endergonic Reaction: Equilibrium Constant, Making Endergonic Reactions Happen
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