This quantity can be calculated for a binary mixture at infinite dilution by plugging an empirically obtained solvent association parameter into the Wilke–Chang equation. The Green–Kubo relation for this quantity sets it equal to the time integral (10[1]-5[1])of the velocity autocorrelation function. Like (-5[1])the curvature of the free energy, this quantity is negative during spinodal decomposition, meaning this quantity’s associated process occurs “uphill.” (-5[1])This quantity, (10[1])whose analog for heat transfer equals (10[1])thermal conductivity divided by density and heat capacity, equals a constant times the product of mean velocity and mean free path for an (10[1])ideal (-5[1])gas. This quantity is the (10[1])proportionality factor in Fick’s laws. (10[3])For 10 points, (10[1])name this (10[1])coefficient (10[3])that quantifies (10[1])the flux (10[2])of particles (10[1])moving (-5[1])from (10[1])high to low concentration. (10[1])■END■ (10[3]0[2])