Gibbs-Helmholtz equation

The Gibbs-Helmholtz equation is a thermodynamic relationship applicable to reversible isobaric chemical processes. It states that the difference between the change in free energy and the heat of reaction equals the product of the absolute temperature and the rate of change of free energy with temperature.1

This equation is named after Josiah Willard Gibbs and Hermann von Helmholtz, who were pioneers in thermodynamics and introduced concepts like Gibbs free energy and Helmholtz free energy. These thermodynamic potentials help describe open systems that exchange heat and work with their environment. The Gibbs free energy, in particular, is used for processes occurring at constant temperature and pressure, such as chemical reactions.23