Question

what is osmotic pressure and how it is different from atmospheric pressure

Answer 1

Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane.


Hydrostatic pressure is the pressure generated by a static (non flowing) column of fluid. For example water in a swimming pool. The deeper you swim the more pressure you can feel. This is because there is more water pressing down on you. That is hydrostatic pressure. Osmotic pressure is the pressure that it takes to make some fluid flow through some membrane.