The **entropy** of an isolated system is defined as

$$ S \equiv k\ln \Omega ,$$

where $k$ is the Boltzmann constant and $\Omega$ is the multiplicity of the system.

The **entropy** of an isolated system is defined as

$$ S \equiv k\ln \Omega ,$$

where $k$ is the Boltzmann constant and $\Omega$ is the multiplicity of the system.

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