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Diffusion - It is the movement of molecules from an area of High concentration to an area of low concentration down a concentration gradient. Basically the molecules go from where they are plenty of them to where there are little.
Osmosis - Osmosis is basically the same thing as diffusion but it deals solely with water.Passage of a solvent (such as water) from a lower-concentration solution to a higher-concentration solution, through a semi-permeable membrane (that allows the solvent to pass but not what is dissolved in it) separating the two solutions.......
Effusion - Effusion is when there is a barrier with one or many small holes that prevent the gas to expand into the new volume unless a gas molecule happens to travel through the hole. ..................

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