Levine, Ira N. Department of Chemistry, Brooklyn College, Brooklyn, New York.
Last reviewed:October 2019
- Pure solids and pure liquids
- Reaction equilibrium
- Phase equilibrium
- Related Primary Literature
- Additional Reading
The activity of a substance is a thermodynamic property that is related to the chemical potential of that substance. Activities are closely related to measures of concentration, such as partial pressures and mole fractions, and are more convenient to use than chemical potentials. The conditions that hold in chemical reaction equilibrium and in phase equilibrium can be expressed in terms of activities of the species involved.
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