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Gibbs-Helmholtz equation |
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Gibbs-Helmholtz equation [′gibz ′helm‚hōlts i‚kwā·zhən] (physical chemistry) An expression for the influence of temperature upon the equilibrium constant of a chemical reaction, (dlnK°/dT)P= ΔH°/RT2, whereK° is the equilibrium constant, ΔH° the standard heat of the reaction at the absolute temperatureT, andRthe gas constant. (thermodynamics) Either of two thermodynamic relations that are useful in calculating the internal energyUor enthalpyHof a system; they may be writtenU=F-T(∂F/∂T)VandH=G-T(∂G/∂T)P, whereFis the free energy,Gis the Gibbs free energy,Tis the absolute temperature,Vis the volume, andPis the pressure. Any of the similar equations for changes in thermodynamic potentials during an isothermal process. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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