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1. It is the movement of the water from the region of its higher concentration to the region of its lower concentration across the semipermeable membrane.

1. It involves the absorption of the water or the solvent molecules by the solid particles.

2. A semipermeable membrane is necessary for the osmosis to take place.

2. The semipermeable membrane is not at all required.

3. The pressure that has developed during the process of osmosis is known as the osmotic pressure.

3. The pressure that is developed during the process of imbibition is the imbibition pressure which is comparatively a high pressure.

4. The heat is not produced.

4. The process of imbibition produces heat production.

5. Osmosis requires the presence of the solute particles.

5. Imbibition requires the presence of colloidal particles.