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activity coefficient

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Activity coefficient
An activity coefficient is a factor used in thermodynamics to account for deviations from ideal behaviour in a mixture of chemical substances. In an ideal mixture, the microscopic interactions between each pair of chemical species are the same (or macroscopically equivalent, the enthalpy change of solution and volume variation in mixing is zero) and, as a result, properties of the mixtures can be expressed directly in terms of simple concentrations or partial pressures of the substances present e.g. Raoult's law. Deviations from ideality are accommodated by modifying the concentration by an activity coefficient. Analogously, expressions involving gases can be adjusted for non-ideality by scaling partial pressures by a fugacity coefficient.

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General Chemistry Glossary

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activity coefficient
()The ratio of activity to concentration; a = c where a, , and c are the activity, activity coefficient, and concentrations, respectively. Activity coefficients are usually obtained from measurements of the emf of electrochemical cells or the colligative properties of solutions.

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activity coefficient
activity coefficient
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    Dizionario inglese-italiano 1.0.012

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    ACTIVITY COEFFICIENT
    COEFFICIENTE DI ATTIVITÀ

    Glosarium Pusat Bahasa Depdiknas Indonesia

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    activity coefficient
    B: (Kimia) koefisien keaktifan

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