Coating Terms

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Think of two fluids with the same chemical composition but differing in concentration which are separated by a semi-permeable membrane. This membrane permits passage of small size solvent molecules but not the large solute molecules. Movement of solvent molecules from an area of low solute concentration to an area of high solute concentration is called “osmosis”. During osmosis, movement of solvent molecules leads to an increase in mass followed by an increase in pressure. The equilibrium in osmosis is reached when concentration difference (driving force of osmosis) and pressure difference which acts against it balance each other.