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Exergonic means to release energy in the form of work. Its etymology stems from the suffix -ergonic, as derived from the Greek root ergon meaning to work, combined with the Greek prefix ex- meaning out of. By thermodynamic standards, work, a form of energy, is defined normally to move from the system (the internal region) to the surroundings (the external region). Thus, an exergonic process, as contrasted with an endergonic process, is one that releases energy from the system, of which it is a part, to the surroundings. As a result, during an exergonic process, energy is released out of the system. If the transformation occurs at constant pressure and temperature, ∆G < 0. When Gibbs free energy is less than 0, the reaction is exergonic (releases energy). Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... In thermodynamics, thermodynamic work is the quantity of energy transferred from one system to another. ... System (from Latin systÄ“ma, in turn from Greek systÄ“ma) is a set of entities, real or abstract, comprising a whole where each component interacts with or is related to at least one other component and they all serve a common objective. ... In a thermodynamics problem, the surroundings, or environment, are anything not part of the system. ... Endergonic means absorbing energy in the form of work. ... In thermodynamics, the Gibbs free energy is a thermodynamic potential which measures the useful work obtainable from a closed thermodynamic system at a constant temperature and pressure. ...

All physical and chemical systems in the universe follow the second law of thermodynamics and proceed in a downhill, i.e. exergonic, direction. Thus, left to itself, any physical or chemical system will proceed, i.e. according to the combined law of thermodynamics, in a direction that tends to lower the free energy of the system, and thus to expend energy in the form of work. These reactions occur spontaneously. In sum, an endergonic reaction is a chemical reaction that absorbs energy in the form of work. The second law of thermodynamics is an expression of the universal law of increasing entropy. ... In thermodynamics, the combined law of thermodynamics is simply a mathemtical summation of the first law of thermodynamics and the second law of thermodynamics subsumed into a single concise mathematical statement as shown below: Here, U is internal energy, T is temperature, S is entropy, P is pressure, and V... The free energy is a measure of the amount of mechanical (or other) work that can be extracted from a system, and is helpful in engineering applications. ... An endergonic reaction is a chemical reaction in which the change in free energy is positive. ... Vapours of hydrogen chloride in a beaker and ammonia in a test tube meet to form a cloud of a new substance, ammonium chloride A chemical reaction is a process that results in the interconversion of chemical substances. ...

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