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change of a quantity

The increment of the value of a quantity Q with time. The change may be expressed either infinitesimally at time t by the differential d Q or d Q t, or in practice it may be expressed by a finite increment over the time interval t 1 t 2, i.e. Q t 2 − Q t 1, which may be written Δ Q or Δ Q t 1 t 2
Δ Q = Δ Q t 1 t 2 = Q t 2 − Q t 1
Examples are: mass change, Δ m; amount of substance change, Δ n; volume change, Δ V; substance concentration change, Δ c.
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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