первый закон Фика(Fick's first law relates the diffusive flux to the concentration under the assumption of steady state. It postulates that the flux goes from regions of high concentration to regions of low concentration, with a magnitude that is proportional to the concentration gradient (spatial derivative) (WK) Alexander Demidov)
закон Фика(Fick's laws of diffusion describes diffusion and can be used to solve for the diffusion coefficient, D. They were derived by Adolf Fick in 1855 (WK) Alexander Demidov)
