| macrostate which does not change spontaneously with time and is stable against small perturbations NOTE 1 Equilibrium state is achieved by an isolated system after sufficiently long time, depending on the considered process. NOTE 2 The equilibrium state is the macrostate having the highest number of different microstates among all macrostates of an isolated system. NOTE 3 Fluctuations exist even in the equilibrium state, but they are not considered in this concept.
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