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Osmosis is the diffusion of water through a semi-permeable membrane, moving from a dilute solution to a more concentrated solution.
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Background Notes Osmosis is the diffusion of water through a semi-permeable membrane, moving from a dilute solution to a more concentrated solution. A semi-permeable membrane can also be known as being selectively permeable, which means it only allows some particles to pass through it. The membrane contains microscopic pores and when placed in a solution it acts as a gateway for the particles. The pores (dependant on their size) allow the smaller individual molecules in the solution to flow through, whilst preventing the larger particles. Water molecules are small molecules, and their movement is due to the process osmosis. This is when water molecules move from a region where they are at a higher concentration to a region where they are at a lower concentration. Osmosis only regards water molecules and their movement. The diagram above shows the movement of the water molecules from the dilute solution, across the membrane into...
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