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velocity

in mass transport
The flux density N B is related to the velocity by the equation
N B = c B v B
The vector v B is the macroscopic average velocity at which the species B moves (which is to be distinguished from the random molecular velocity); c B is the concentration of species B (mol m −3). Note that the velocity is defined with respect to a frame of reference.
Source:
PAC, 1981, 53, 1827 (Nomenclature for transport phenomena in electrolytic systems) on page 1830
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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.V06608.
Original PDF version: http://www.iupac.org/goldbook/V06608.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 The PDF version is out of date and is provided for reference purposes only.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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