Diffusion refers to the process by which molecules intermingle as a result of their kinetic energy of random motion. A distinguishing feature of diffusion is that it results in mixing or mass transport, without requiring bulk motion. According to Fick's laws, the diffusion flux is proportional to the negative gradient of concentrations. It goes from regions of higher concentration to regions of lower concentration.
II. Osmosis
Osmosis is the spontaneous net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides. (Low concentration to high concetration)
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