Fick's law

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A law describing the diffusion that occurs when solutions of different concentrations come into contact, with molecules moving from regions of higher concentration to regions of lower concentration. Fick's law states that the rate of diffusion dn/dt, called the diffusive flux and denoted J, across an area A is given by: dn/dt = J = –DAc/∂x, where D is a constant called the diffusion constant, ∂c/∂x is the concentration gradient of the solute, and dn/dt is the amount of solute crossing the area A per unit time. D is constant for a specific solute and solvent at a specific temperature. Fick's law was formulated by the German physiologist Adolf Eugen Fick (1829–1901) in 1855.

Subjects: Chemistry.

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