Thermodynamic Functions of Solutions

Abstract

The chemical potential (μ_i and fugacity (f_i) are alternative but related measures of the escaping tendency of a substance. The necessary condition of equilibrium between two phases, α and β, with respect to the diffusion of any component i, which is free to move between these phases, can be expressed as either

$$ \mu_i^{\alpha } = \mu_i^{\beta } $$

(1.1)

or

$$ f_i^{\alpha } = f_i^{\beta } $$

(1.1)

.