Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Free Energy

  • Jacques ReisseEmail author
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_601-2


Free energy refers to the amount of energy in a system that can be converted to work when the reaction takes place at constant pressure. This amount of energy is necessarily less than the available enthalpy. For chemical reactions taking place at constant pressure (which is frequently the case), free energy refers to the Gibbs free energy. The thermodynamic definition of the Gibbs energy (G) leads to the familiar relation G = H − TS, where H stands for enthalpy, T for temperature, and S for entropy.

See Also


Free Energy Gibbs Energy Bioorganic Chemistry Constant Pressure Familiar Relation 
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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Université Libre de BruxellesBrusselsBelgium