I  U  P  A  C

News & Notices

Organizations & People

Standing Committees



..By Year
..Other Committees




Links of Interest

Search the Site

Home Page


 Abbreviated list of quantities, units and symbols in physical chemistry

 4.4 physical quantities: chemical kinetics

Physical Quantity Symbol SI Unit
rate of conversion  x mol s-1
rate of concentration change of substance B (through chemical reaction) vB, rB mol m-3 s-1
rate of reaction v mol m-3 s-1
overall order of reaction n 1
rate constant, rate coefficient k (m3 mol-1)n-1 s-1
half life t1/2 s
pre-exponential factor A (m3 mol-1)n-1 s-1
energy of activation E, Ea J mol-1
Gibbs energy of activation DG J mol-1
collision cross section s m2
collision frequency(of A with A)  zA (A)  s-1
collision frequency factor zAB m3 mol-1 s-1
quantum yield, photochemical yield f, F 1

Page last modified 29 May 2000.
Copyright © 2000 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact web manager.