# Self-diffusion

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According to IUPAC definition,^{[1]} **self-diffusion** coefficient is the diffusion coefficient of species when the chemical potential gradient equals zero. It is linked to the diffusion coefficient by the equation:

Here, is the activity of the species in the solution and is the concentration of . This term is commonly assumed to be equal to the tracer diffusion determined by watching the movement of an isotope in the material of interest.