Inicio > Term: chemical activity
chemical activity
(i) A dimensionless measure of the deviation of the chemical potential of a substance from its value at a standard state. It is defined by the equation: µ = µ°+ RT ln a, where µ is the chemical potential at activity = a, µ°is the chemical potential in the standard state (where a = 1. 0), R is the molar gas constant, and T is the absolute temperature. In solution a = molal concentration at infinite dilution (molal concentration = molar concentration at low concentrations), and in gases a = partial pressure in atmospheres. (ii) Informally, in solution, it may be taken as the effective concentration of a substance.
- Parte del discurso: noun
- Industria/ámbito: Ciencias de la Tierra
- Categoría: Ciencia del suelo
- Company: Soil Science Society of America
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Creador
- Bob Adams
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