Diffusion is the flow of matter, liquids, solid, and gases from an area of higher concentration to a region of lower concentration until equilibrium are attained. Illustrations of diffusion are the smell of perfume, whenever we open a perfume bottle and the spread of color if a crystal of potassium permanganate is put into a utensil of water.

Whenever a substance undergoes diffusion, its particles begin moving. Whenever the moving particles counter a surface, the surface offers resistance to the impact of diffusing particles. This leads to the development of pressure termed as diffusion pressure. Diffusion always takes place from a level of higher diffusion pressure to a level of lower diffusion pressure. A pure solvent contains maximum diffusion pressure and addition of solutes lowers the diffusion pressure. The amount by which the diffusion pressure of a solution is lower than that of the pure solvent is termed as Diffusion Pressure Deficit (DPD). However the recent trend is to use the word water potential to elucidate diffusion of water.

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