Key points are not available for this paper at this time.
The present note provides a rigorous definition and justification for the use of a ``local'' or ``point'' chemical potential (or activity coefficient), constant in value, in a transition region between two phases, or in the immediate neighborhood of a particular molecule or ion in a homogeneous fluid or solution. In the transition case, other quasi-thermodynamic point functions are also given exact definition; for example, the Helmholtz free energy, internal energy, and entropy. Possible applications, past and future, include the theory of liquids, solutions, electrolytes, and surface tension.
Terrell L. Hill (Mon,) studied this question.