Net movement of molecules across the nuclear membrane until the number of molecules on each side is nearly equal
Explanation:
The net spontaneous movement of the molecules of a solvent through the selective membrane to an area of higher concentration of the solvent is the process of Osmosis.
By this process in a solvent separates the 2 solutions of various concentrations. The pressure through which the movements were initiated is the ‘osmotic pressure’. The membrane should be permeable for molecule movements.