. . . "Extent of Reaction"@en . "\\(\\xi\\)"^^ . . "\\(dn_B = \\nu_B d\\xi\\), where \\(n_B\\) is the amount of substance \\(B\\) and \\(\\nu_B\\) is the stoichiometric number of substance \\(B\\)."^^ . . "http://en.wikipedia.org/wiki/Extent_of_reaction"^^ . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31894"^^ . "In physical chemistry, the \"Extent of Reaction\" is a quantity that measures the extent in which the reaction proceeds." . .