text: A value representing this process is in the denominators of both the Sherwood and Schmidt numbers.
full_question: A value representing this process is in the denominators of both the Sherwood and Schmidt numbers. The kinematic viscosity and a thermal quantity symbolized alpha are analogous to the coefficient of this process in the Chilton-Colburn analogy. When analyzing semiconductors, one commonly derives the drift current and the current named for this phenomenon. This phenomenon couples with convection and advection for bulk mass transport. A law of this phenomenon, which has the error function as its solution, sets the time deriva- tive of concentration equal to a constant times the Laplacian of concentration. For 10 points, name this motion of particles down the concentration gradient that obeys Fick's law.
first_sentence: A value representing this process is in the denominators of both the Sherwood and Schmidt numbers.
raw_answer: diffusion [or diffusive flux; or diffusivity; or diffusion coefficient]