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change ratio of a quantity

A term which may be expressed infinitesimally at time t by a ratio of differentials d Q 1 t d Q 2 t where the kind of quantities are the same but for different components in the same system. In practice, the ratio for a finite interval is:
Δ Q 1 t 1 t 2 Δ Q 2 t 1 t 2
Examples are: mass change ratio, d m 1 t d m 2 t; amount of substance change ratio, d n 1 t d n 2 t.
PAC, 1992, 64, 1569 (Quantities and units for metabolic processes as a function of time (IUPAC Recommendations 1992)) on page 1571
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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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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