Tolman's rule, also known as Tolman's principle, is a concept in statistical mechanics that pertains to the behavior of chemical systems, particularly in the context of phase transitions and equilibrium. Named after physicist Richard Tolman, the rule suggests that in a system at equilibrium, the chemical potential of all components must be equal throughout the system, including at the interfaces between different phases. In terms of a more practical application, Tolman's rule implies that: 1. For various phases of a substance (e.
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