Question

what is osmotic pressure
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Answer 1

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$\implies$Osmosis is the diffusion of a fluid through a semipermeable membrane.

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Answer 2

Answer:

Osmotic pressure can be thought of as the pressure that would be required to stop water from diffusing through a barrier by osmosis. In other words, it refers to how hard the water would “push” to get through the barrier in order to diffuse to the other side.

Explanation:

Osmotic pressure is determined by solute concentration – water will “try harder” to diffuse into an area with a high concentration of a solute, such as a salt, than into an area with a low concentration.

In reality of course, osmotic pressure is not a “desire” of water to move, but rather an extension of the natural law that all matter will become randomly distributed over time. When the concentrations of substances are different in two areas and the areas have contact with each other, the random motion of particles will cause the substances to diffuse until the solution is uniform throughout the whole area.