Gibbs entropy is a statistical measure of disorder or randomness in a thermodynamic system, defined by the formula $S = -k_B \sum p_i \ln(p_i)$, where $S$ is entropy, $k_B$ is the Boltzmann constant, and $p_i$ represents the probability of the system being in a particular microstate. This concept connects the microscopic properties of particles to macroscopic thermodynamic behavior, emphasizing the role of probability in determining entropy values.
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