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Reference.org
Fick's laws of diffusion
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<p>Fick's laws of diffusion describe <a href="/facts/Diffusion/KbAxroBa">diffusion</a> and were first posited by <a href="/facts/Adolf_Fick/oqUvaXCA">Adolf Fick</a> in 1855 on the basis of largely experimental results. They can be used to solve for the <a href="/facts/Mass_diffusivity/GSngNem0">diffusion coefficient</a>, D. Fick's first law can be used to derive his second law which in turn is identical to the <a href="/facts/Diffusion_equation/l3CUuLqF">diffusion equation</a>. </p><p><i>Fick's first law</i>: Movement of particles from high to low concentration (diffusive flux) is directly proportional to the particle's concentration gradient. </p><p><i>Fick's second law</i>: Prediction of change in concentration gradient with time due to diffusion. </p><p>A diffusion process that obeys Fick's laws is called normal or Fickian diffusion; otherwise, it is called <a href="/facts/Anomalous_diffusion/vSVM53kY">anomalous diffusion</a> or non-Fickian diffusion. </p>