Question

Define reverse osmosis.

Answer 1

It is a process in which a solvent passes to a porous membrane in the direction opposite to thatfor natural osmosis

Answer 2

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In osmosis, net flow of solvent across the semipermeable membrane is from solvent to solution. The flow can be reversed by applying pressure greater than osmotic pressure on the solution.

This is called reverse osmosis. It is used for desalination of sea water.