Preferred Label : activity coefficient;
Detailed label : activity coefficient, f, γ;
IUPAC definition : The activity coefficient fB of a substance B in a liquid or solid mixture containing
mole fractions x B, x C, ... of the substances B, C, ... is a dimensionless quantity
defined in terms of the chemical potential µ B of B in the mixture by: \[R\ T\ \ln
(x_{{B}}\ f_{{B}}) μ _{{B}}\left({cd},\,T,\,P,\,x\right)- μ _{{B}} {*}\left({cd},\,T,\,p\right)\]
where x denotes the set of mole fractions x B, x C, ... . The activity coefficient
γ B of a solute B in a solution (especially a dilute liquid solution) containing molalities
m B, m C, ... of solutes B, C, ... in a solvent A is a dimensionless quantity defined
in terms of the chemical potential µ B by: \[R\ T\ \ln \left(\frac{m_{{B}}\ γ _{{B}}}{m
{\ominus}}\right) μ _{{B}}- \left\{μ _{{B}}- R\ T\ \ln \left(\frac{m_{{B}}}{m {\ominus
}}\right)\right\} {\infty }\];
Origin ID : A00116;
See also
The activity coefficient fB of a substance B in a liquid or solid mixture containing
mole fractions x B, x C, ... of the substances B, C, ... is a dimensionless quantity
defined in terms of the chemical potential µ B of B in the mixture by: \[R\ T\ \ln
(x_{{B}}\ f_{{B}}) μ _{{B}}\left({cd},\,T,\,P,\,x\right)- μ _{{B}} {*}\left({cd},\,T,\,p\right)\]
where x denotes the set of mole fractions x B, x C, ... . The activity coefficient
γ B of a solute B in a solution (especially a dilute liquid solution) containing molalities
m B, m C, ... of solutes B, C, ... in a solvent A is a dimensionless quantity defined
in terms of the chemical potential µ B by: \[R\ T\ \ln \left(\frac{m_{{B}}\ γ _{{B}}}{m
{\ominus}}\right) μ _{{B}}- \left\{μ _{{B}}- R\ T\ \ln \left(\frac{m_{{B}}}{m {\ominus
}}\right)\right\} {\infty }\]
