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Diffusion is the net movement of molecules or atoms from a region of high concentration with high chemical potential to a region of low concentration with low chemical potential.
There are three categories of diffusion mechanisms: 1  Direct diffusion occurs when two cultures are very close to each other, resulting in intermarriage, trade, and even warfare. 2  Forced diffusion occurs when one culture subjugates (conquers or enslaves) another culture and forces its own customs on the conquered people.