diffusion is d movement of substances or particles(molecules)4rm an area wer dey r more(higher conc gradient)to a place wer dey are less(low conc gradient)example d gas of a perfume gas water or solids cn move dis way.osmosis on d oder hand is movement of particules of molecules frm a place wer dey r less(low conc gradient)2 a place wer dey r more(higher conc gradient)only wen we have a membrane or surface btw d two areas.eg theplasma membrane of cell is such a surface.it alows water 2 move in bnth directions dependin on conc gradient.
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