What is 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. In regular osmosis, the water molecules move from the higher concentration ( pure water `=` hypotonic ) to lower concentration ( salt water `=` hypertonic) . But in reverse osmosis, the water molucules move from the lower concentration ( salt water `=` hypertonic ) to higher concentration ( pure water `=` hypotonic ) through a selectively permeable membrane.
Uses : Reverse osmosis is used for purification of drinking water and desalination of seawater.