A dispersion parameter and an induction parameter are used to estimate this quantity in the MOSCED model. Both the NRTL and Wilson model of this quantity cannot (15[1])describe (15[1])its extrema, unlike a two-suffix model named after this quantity that takes a power series of Gibbs free energy over RT (15[1])with respect to mole fraction and is named after (15[1])Max Margules. This (15[1])quantity (15[1])is divided into residual and combinatorial (15[2])components in the (*) UNIFAC (-5[1])model. The Pitzer (10[1])equation (10[1])gives values of this quantity in natural water. (10[1])In the case of infinite dilution, this quantity can (10[1])be predicted from the square root of ionic strength by the Debye-Huckel (-5[1])equation. This quantity equals 1 for mixtures that obey Raoult’s (-5[1])law. (10[2]-5[1])This quantity corresponds to the fugacity coefficient in gases. (10[1])For 10 points, (-5[1])name this quantity symbolized gamma that measures deviations (-5[1])of a mixture from ideality. ■END■ (10[2]0[9])