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    • https://phys.libretexts.org/Bookshelves/Thermodynamics_and_Statistical_Mechanics/Essential_Graduate_Physics_-_Statistical_Mechanics_(Likharev)/06%3A_Elements_of_Kinetics/6.03%3A_Electrochemical_potential_and_drift-diffusion_equation
      Now let us generalize our calculation to the case when the particle transport takes place in the presence of a time-independent spatial gradient of the probability distribution caused for example by t...Now let us generalize our calculation to the case when the particle transport takes place in the presence of a time-independent spatial gradient of the probability distribution caused for example by that of the particle concentration (and hence of the chemical potential μ) while still assuming that temperature T is constant.
    • https://phys.libretexts.org/Bookshelves/Thermodynamics_and_Statistical_Mechanics/Essential_Graduate_Physics_-_Statistical_Mechanics_(Likharev)/05%3A_Fluctuations/5.06%3A_The_Kramers_problem_and_the_Smoluchowski_equation
      The first form of this relation allows a simple interpretation: the probability flow is proportional to the spatial gradient of the probability density (i.e., in application to \(N >> 1\) similar and ...The first form of this relation allows a simple interpretation: the probability flow is proportional to the spatial gradient of the probability density (i.e., in application to \(N >> 1\) similar and independent particles, just to the gradient of their concentration \(n = Nw\)), with the sign corresponding to the flow from the higher to lower concentrations.

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