In a given macropartition, the total entropy of a system comprised of two or more parts is always equal to the sum of the entropies of those parts.

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The entropy of a system is a measure of its disorder. The more disordered a system is, the higher its entropy. When two or more systems are combined, the total entropy of the combined system is always greater than or equal to the sum of the entropies of the individual systems. This is because the combined system has more degrees of freedom than the individual systems, and therefore more ways to be disordered.

In a Given Macropartition, the Total Entropy of a System