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Osmosis - movement if solvent from higher to lower concentration through a semi permeable membrane
diffusion - mere movement from higher to lower concentration 
imbibition- displacement of a miscible fluid by another immiscible fluid
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 Absorption of fluid by a solid body without resultant chemical change in either.2. Taking up of water by a gel, thereby increasing its size.
Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
Diffusion is a process where molecules from a highly concentrated area move to a place where there are fewer molecules. It is a spontaneous and automatic process that carries oxygen to the blood in the lungs and oxygen from the blood to the rest of the body tissues.

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