Diffusion | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Diffusion


00:01:00 1 Diffusion vs. bulk flow
00:03:06 2 Diffusion in the context of different disciplines
00:05:43 3 History of diffusion in physics
00:09:47 4 Basic models of diffusion
00:09:56 4.1 Diffusion flux
00:13:46 4.2 Fick's law and equations
00:15:44 4.3 Onsager's equations for multicomponent diffusion and thermodiffusion
00:23:19 4.4 Nondiagonal diffusion must be nonlinear
00:23:33 4.5 Einstein's mobility and Teorell formula
00:25:48 4.5.1 Teorell formula for multicomponent diffusion
00:26:59 4.6 Jumps on the surface and in solids
00:27:47 4.7 Diffusion in porous media
00:33:22 5 Diffusion in physics
00:36:30 5.1 Elementary theory of diffusion coefficient in gases
00:42:42 5.2 The theory of diffusion in gases based on Boltzmann's equation
00:44:35 5.3 Diffusion of electrons in solids
00:44:45 5.4 Diffusion in geophysics
00:49:03 6 Random walk (random motion)
01:10:25 6.1 Separation of diffusion from convection in gases
01:11:29 6.2 Other types of diffusion
01:12:29 7 See also
01:13:13 8 References
01:14:42 Other types of diffusion



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SUMMARY
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Diffusion is the net movement of molecules from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in chemical potential of the diffusing species.
A gradient is the change in the value of a quantity e.g. concentration, pressure, or temperature with the change in another variable, usually distance. A change in concentration over a distance is called a concentration gradient, a change in pressure over a distance is called a pressure gradient, and a change in temperature over a distance is called a temperature gradient.
The word diffusion derives from the Latin word, diffundere, which means "to spread way out".
A distinguishing feature of diffusion is that it depends on particle random walk, and results in mixing or mass transport without requiring directed bulk motion. Bulk motion, or bulk flow, is the characteristic of advection.
The term convection is used to describe the combination of both transport phenomena.