What is the relationship between osmotic pressure and osmolarity?

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Osmotic pressure is the pressure difference resulting from solute concentration differences across a semipermeable membrane, driving water movement until hydrostatic pressure balances it. Osmolarity, on the other hand, quantifies the concentration of solute in a solution, such as the approximately 330 mOsm in blood. While osmotic pressure and osmolarity are related, they are not the same; osmotic pressure is a consequence of osmolarity. Understanding this relationship is crucial for grasping concepts in fluid dynamics and biological systems. For further insights, exploring "Donnan equilibrium" may provide additional context.
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I researched on the internet but I can't understand. Please in simple words can someone explain. Is it the same as osmolarity. What is the difference?
 
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'osmotic pressure' is a pressure difference the is caused by differences in concentration of a solute. Imagine an open container with a semipermeable membrane, one side has pure water and the other has (for example) saline. The osmotic pressure jump across the membrane will drive water through the membrane, until the change in hydrostatic pressure (the movement of water will change the volume of both sides) compensates.

'osmolarity' is a quantitative measure of the concentration of solute. Blood, for example, is about 330 mOsm.

Look up "Donnan equilibrium" for more information.
 

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