The thermal form of this process subject to the Soret effect was investigated by Clusius and Dickel using an insulated column. The force of a “self” form of this process is given by the derivative of chemical potential with respect to distance. The Schmidt number relates the kinematic viscosity of a fluid to this process. The Wilke–Chang correlation can be used to estimate this process and uses a solute–solvent interaction factor. Random walks (10[1])were related to a parabolic equation named for this process by Einstein. (10[1]-5[1])The letter D (10[1])represents a coefficient (10[1])of this (10[1])process in two laws (10[1])of it named for Fick. (10[1])Solvent undergoes a specific form of this (10[1])process across membranes in osmosis. (10[3]-5[1])For 10 points, name this general process where particles travel down concentration gradients. ■END■ (10[1]0[1])