Of a substance B, \(f_{\text{B}}\) or \(\tilde{p}_{\text{B}}\), in a gaseous mixture is defined by \(f_{\text{B}}=\lambda _{\text{B}}\ \lim _{p\rightarrow 0}\frac{p_{\text{B}}}{\lambda _{\text{B}}}\), where \(p_{\text{B}}\) is the @P04420@ of B and \(λ_{\text{B}}\) its @A00019@.
Green Book, 2nd ed., p. 50 [Terms] [Book]
See also:
PAC, 1984, 56, 567. (Physicochemical quantities and units in clinical chemistry with special emphasis on activities and activity coefficients (Recommendations 1983)) [Terms] [Paper]
PAC, 1994, 66, 533. (Standard quantities in chemical thermodynamics. Fugacities, activities and equilibrium constants for pure and mixed phases (IUPAC Recommendations 1994)) [Terms] [Paper]