Actiivsuskoefitsienti
Actiivsuskoefitsienti (activity coefficient) is a thermodynamic parameter that quantifies the deviation of a species in a mixture from ideal behavior. In an ideal solution, the chemical potential of a component depends only on its mole fraction. In real solutions, interactions between molecules cause the chemical potential to differ from this ideal prediction. The activity coefficient corrects for these interactions by relating the actual activity of a species to its concentration or mole fraction.
Mathematically, the activity a_i of species i is expressed as a_i = γ_i x_i, where x_i is the
The activity coefficient depends on temperature, pressure, composition, and the nature of intermolecular forces. It is
Accurate determination of activity coefficients is essential for predicting the behavior of solutions in fields ranging