In a fully ionized plasma, this phenomenon is proportional to ion velocity times the square of the Larmor radius, which produces a one-half-power dependence on electron temperature. The KPP equation is a one-dimensional form of a system in which this phenomenon is represented by a diagonal matrix multiplying a Laplacian term that is paired with a local reaction term. A term representing this phenomenon is added to an advective flux term in an equation named for drift and this phenomenon. This phenomenon’s coefficient is proportional to temperature and mobility, as identified by Einstein. The flux of this phenomenon is proportional to a concentration gradient by Fick’s laws. For 10 points, name this phenomenon (10[1])in which particles move from high to low concentrations. (10[1])■END■ (10[1])