What is osmosis?

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Osmosis is just the word used to describe the movement of water, always from a high concentration of water to a low concentration of water. The new area may have a low concentration of water because there are lots of other molecules there (e.g. glucose), so there are fewer water molecules.

The water always moves across a semi-permeable membrane, such as the cell membrane! Semi-permeable simply means that it has little holes in it for the water to get through.

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