For 10 points, name this mass analogue of the thermal conductivity, which equals the ratio of the mass flux to the concentration gradient by Fick's law.
A semiempirical equation for this quantity states that it is proportional to temperature to the 1.75 divided by the pressure. A method of calculating this quantity for liquids introduces a solvent association parameter, which is approximately 2.6 for water. In a tokamak, the existence of banana orbits around a torus gives rise to the neoclassical form of this quantity, which is 10 to 100 times larger than its classical form. The method of Fuller and the Wilke-Chang equation are used to calculate this quantity, which (*) kinetic theory predicts is proportional to the product of the mean velocity and the mean free path, or alternately, the product of Boltzmann's constant, temperature, and mobility. This quantity is set proportional to the square of the step size divided by the time between steps when modeling the phenomenon it describes as a random walk. For 10 points, name this mass analogue of the thermal conductivity, which equals the ratio of the mass flux to the concentration gradient by Fick's law.
A semiempirical equation for this quantity states that it is proportional to temperature to the 1.75 divided by the pressure.
diffusion coefficient [or mass diffusivity or diffusion constant]