Activity Coefficients
The activity coefficient, γi, is
defined as the relationship between concentration and thermodynamic activity:
γi = ai / mi
where ai and and mi are the
activity and molality,
respectively, of the aqueous species “i”.
When writing equations, concentrations are usually written with brackets,
for example “[H+]”, while activities are
often written with braces, “{H+}”.
See also:
