tharmodynamic stability
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Thermodynamic stability is a term used in chemistry to describe a chemical system that is neither consuming nor releasing heat energy. In the absence of a change in thermal energy, the substance is not undergoing a chemical reaction and is, therefore, stable.
Chemical stability when used in the technical sense in chemistry, means thermodynamic stability of a chemical system.[1]
Thermodynamic stability occurs when a system is in its lowest energy state, or chemical equilibrium with its environment. This may be a dynamic equilibrium, where individual atoms or molecules change form, but their overall number in a particular form is conserved. This type of chemical thermodynamic equilibrium will persist indefinitely unless the system is changed. Chemical systems might include changes in the phase of matter or a set of chemical reactions.
State A is said to be more thermodynamically stable than state B if the Gibbs energy of the change from A to B is positive.