Asked by  | 23rd Aug, 2009, 12:44: PM

Expert Answer:

Diffusion is the spontaneous movement of a substance from a region of its higher concentration to a region of its lower concentration. Osmosis is diffusion followed by water molecules. Here, water molecules move from a region of higher water concentration through a semi-permeable to a region of low water concentration.

Diffusion occurs without a membrane whereas osmosis occurs across a semi-permeable membrane.

Diffusion may also occur in gases besides liquids, but osmosis only occurs in aqueous solutions.

Osmosis is also relatively slower than diffusion.

Diffusion may disperse molecules over a very long distance but osmosis generally occurs over a short distance.

Answered by  | 25th Aug, 2009, 09:04: AM

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