Osmosis is a spontaneous process by which the solvent molecules pass from a solution of low concentration to a solution of high concentration through a semi-permeable membrane. It is of two types. They are Endosmosis and Exosmosis.
Osmotic Pressure is the pressure required to stop the process of osmosis. In other words, we can say that the pressure required to stop the spontaneous flow of solvent molecules from low concentrated solution to high concentrated solution through a semi-permeable membrane.
Osmotic pressure can be calculated using the equation-
π= C S T
where π is the osmotic pressure
C is the molar concentration of the solute
S is the Solution constant
T is the temperature