What is the principle of reverse osmosis?

Explanation

Reverse Osmosis follows the same principles of osmosis, but in the reverse direction. In this process movement of water is reversed by applying pressure to force the water against a concentration gradient of the solution.
2. In reverse osmosis the water molecules move from the lower concentration (salt water = hypertonic ) to higher concentration (pure water = hypotonic ) through a selectively permeable membrane.
3. Use : Reverse osmosis is used for purification of drinking water and desalination of seawater .