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==Local thermodynamic equilibrium==

==Local thermodynamic equilibrium==

Various principles have been proposed by diverse authors for over a century. According to Glansdorff and Prigogine (1971, page 15),<ref name="G&P 1971">Glansdorff, P., Prigogine, I. (1971). ''Thermodynamic Theory of Structure, Stability and Fluctuations'', Wiley-Interscience, London. {{ISBN|0-471-30280-5}}</ref> in general, these principles apply only to systems that can be described by thermodynamical variables, in which [[Dissipative system|dissipative processes]] dominate by excluding large deviations from statistical equilibrium. The thermodynamical variables are defined subject to the kinematical requirement of local thermodynamic equilibrium. This means that collisions between molecules are so frequent that chemical and radiative processes do not disrupt the local Maxwell-Boltzmann distribution of molecular velocities.

Various principles have been proposed by diverse authors for over a century. According to Glansdorff and Prigogine (1971, page 15),<ref name="G&P 1971">Glansdorff, P., Prigogine, I. (1971). ''Thermodynamic Theory of Structure, Stability and Fluctuations'', Wiley-Interscience, London. {{ISBN|0-471-30280-5}}</ref> in general, these principles apply only to systems that can be described by thermodynamical variables, in which [[Dissipative system|dissipative processes]] dominate by excluding large deviations from statistical equilibrium. The thermodynamical variables are defined subject to the kinematical requirement of local thermodynamic equilibrium. This means that collisions between molecules are so frequent that chemical and radiative processes do not disrupt the local Maxwell-Boltzmann distribution of molecular velocities.