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 its extrema, unlike a two-suffix model named after this quantity that takes a power series of Gibbs free energy over RT with respect to mole fraction and is named after (15[1])Max Margules. This quantity (15[1])is divided into residual and combinatorial components in the (*) UNIFAC model. The Pitzer (10[1])equation (10[1])gives values of this quantity in natural water. In the case of infinite dilution, this quantity can be predicted from the square root of ionic strength by the Debye-Huckel equation. This quantity equals 1 for mixtures that obey Raoult’s law. (-5[1])This quantity corresponds to the fugacity coefficient in gases. For 10 points, name this quantity symbolized gamma that measures deviations of a mixture from ideality. ■END■ (0[1])