Asked by | 23rd Aug, 2009, 12:44: PM
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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