is related to the
velocity by the equation
is the macroscopic average velocity at which the species B moves (which is to be distinguished
from the random molecular velocity);
is the concentration of species B
Note that the velocity is defined with respect to a frame of reference.
PAC, 1981, 53, 1827
(Nomenclature for transport phenomena in electrolytic systems)
on page 1830
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. https://doi.org/10.1351/goldbook