What is a diffusion path in scientific terms?

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Hi!

I'm a student and I have a project to do. It's about the diffusion's path. My problem is that I can't find a definiction of diffusion path. Could anybody be able to tell my where to look, or what is that?
 
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Some starters: http://en.wikipedia.org/wiki/Mean_free_path" .
 
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From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...
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