(the spreading of particles toward an even distribution)
Diffusion is the net movement of particles such as atoms or
molecules from areas of higher concentration to areas of lower
A diffusion equation is an equation describing diffusion
over time. Fick's laws include a diffusion equation describing
what happens in many cases, a type of diffusion termed
Fickian diffusion. The equation:
J = -D ——
- J - the diffusive flux, the flow of the diffusing substance as amount of substance/unit time through a unit area.
- D - the diffusion coefficient (aka diffusivity) of the substance.
- C - the concentration of the diffusing material, as in amount of substance per unit volume.
- x - measurement over a direction over which we are describing the diffusion.
Amount of substance is a measure of the number of particles
(atoms or molecules) of the substance typically counted in moles
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