Självdiffusion
Self-diffusion describes the diffusive motions of molecules within themselves e.g. the movement of a water molecule in water. According to the IUPAC definition, the self-diffusion coefficient D_i^* of medium i is the diffusion coefficient D_i of a chemical species in said medium when the concentration of this species is extrapolated to zero concentration. It can be described by the equation:
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Självdiffusion innebär vandring av atomer, molekyler eller joner i en fas (fast, flytande eller gasformig) bestående av just atomer, molekyler eller joner. Självdiffusion innebär således ingen förändring av den kemiska sammansättningen.
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