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What is diffusion?

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What is diffusion?
posted Jan 29 by Sushil Thakur

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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.

Credit: https://en.wikipedia.org/wiki/Diffusion

answer Jan 30 by Salil Agrawal
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