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In statistical mechanics, multiplicity refers to the number of microstates corresponding to a particular macrostate of a thermodynamic system. Commonly denoted Ω {\displaystyle \Omega } , it is related to the configuration entropy of an isolated system via Boltzmann's entropy formula

where S {\displaystyle S} is the entropy and k = 1.38 ⋅ 10 − 23 J / K {\displaystyle k=1.38\cdot 10^{-23}\,\mathrm {J/K} } is Boltzmann's constant.

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