Case: Read the paragraph and answer the following questions

      There are many phenomena which we observe in nature or at home. For example, raw mangoes shrivel when pickled in brine (salt water). If we look into this processes we find one thing common in all, that is, all these substances are bound by membranes. These membranes appear to be continuous sheets or films, yet they contain a network of sub microscopic holes or pores. Membranes having this kind of properties are known as semipermeable membranes (SPM).  If this membrane is placed between the solvent and solution the solvent molecules will flow through the membrane from pure solvent to the solution. This process of flow of the solvent is called osmosis. The flow of the solvent from its side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution.  This pressure has been found to depend on the concentration of the solution.

The pressure applied to stop the solvent from its side to solution side across a semipermeable membrane called?

Osmotic pressure

The flow of the solvent from its side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution. This pressure that just stops the flow of solvent is called osmotic pressure of the solution.