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rate of change ratio

The quotient of two rates where the quantities are of the same kind in the same system for different components:
d Q 1 / d t d Q 2 / d t
For finite time intervals, mean rate of change ratio is:
Δ Q 1 / Δ t Δ Q 2 / Δ t = Δ Q 1 Δ Q 2 Δ t
Rate of change ratio has the dimension one. The denominator is often called the reference quantity. Examples are: mass rate ratio, d m 1 / d t d m 2 / d t; amount of substance rate ratio, d n 1 / d t d n 2 / d t.
Source:
PAC, 1992, 64, 1569 (Quantities and units for metabolic processes as a function of time (IUPAC Recommendations 1992)) on page 1572
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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.R05145.
Original PDF version: http://www.iupac.org/goldbook/R05145.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 The PDF version is out of date and is provided for reference purposes only.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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