IUPAC > Gold Book > alphabetical index > A > activity (relative activity), a


activity (relative activity), a

Defined by the equation
a = e μ − μ 0 R T
where R is the gas constant, T the thermodynamic temperature, μ the chemical potential and μ 0 the standard chemical potential the definition of which depends on the choice of the standard state.
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 989
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.A00115.
Original PDF version: http://www.iupac.org/goldbook/A00115.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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