Polymers
What is reverse osmosis and how does it make drinking water safe?
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HowStuffWorks
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HowStuffWorks
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Osmosis is defined as the movement of a solvent through a semipermeable membrane (such as that of a living cell), so that the concentration of the solute on both sides of the membrane is equal. Semipermeable membranes do not allow for all substances to pass through; for example some will allow water to pass but not salt. These can be used to create reverse osmosis. In this instance, the solution is placed under enormous pressure and the solvent is pushed out through the membrane, which acts like a fine filter. This process is used to purify seawater into drinkable water.
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