Ficks second law
Consider diffusion at the front and rear surfaces of an incremental planar volume. Fick’s 2nd law of diffusion describes the rate of accumulation (or depletion) of concentration within the volume as proportional to the local curvature of the concentration gradient.
What is the formula for Fick’s law?
Movement of solute from higher concentration to lower concentration across a concentration gradient. J = ? D d ? d x. Where, J: diffusion flux. D: diffusivity.
What is ficks 1st law?
in which the flux J [cm–2 s–1] is proportional to the diffusivity [cm2/s] and the negative gradient of concentration, [cm–3 cm–1] or [cm–4]. … The flux J is driven by the negative gradient in the direction of increasing x.