Water Diffusion: Osmosis
The special case of diffusion of water into and out of cells is called osmosis. Because osmosis is the diffusion of water, it is the movement of water from an area with a high concentration of water molecules to an area with a low concentration of water molecules; that is, water diffuses from an area in which water is abundant to an area in which water is scarce. Osmosis in cells is usually defined in different terms, however. It is the movement of water from a low concentration of salts to an area with a high concentration of salts, across a semi-permeable membrane.
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Yeagle, Philip. The Membrane of Cells. 2nd ed. San Diego: Academic Press, 1993.
Science EncyclopediaScience & Philosophy: Dependency - The Intellectual Roots Of Dependency Thinking to Dirac equationDiffusion - Concentration Gradients, Diffusion In Cells, Water Diffusion: Osmosis - The importance of diffusion