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rate of conversion, ξ .

The rate of conversion for a reaction occurring in a closed system is defined as the time derivative of the extent of reaction:
ξ . = d ξ d t
In view of the definition of extent of reaction it follows that with reference to any species in a reaction showing time-independent stoichiometry
ξ . = d ξ d t = 1 ν i d n i d t
where n i is the amount of the species at any time and ν i is its stoichiometriccoefficient.
Source:
PAC, 1996, 68, 149 (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 180
PAC, 1992, 64, 1569 (Quantities and units for metabolic processes as a function of time (IUPAC Recommendations 1992)) on page 1573
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 > Gold Book > math/physics > quantities
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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.R05147.
Original PDF version: http://www.iupac.org/goldbook/R05147.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 The PDF version is out of date and is provided for reference purposes only.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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