Osmosis is a special type of diffusion of liquids. Osmosis can also be defined as the movement of water molecules from a region of higher free energy to a region of lower free energy through a semi permeable membrane until they reach a state of dynamic equilibrium.


The potential with which the water molecules diffuse through the membrane is called osmotic potential. The osmotic potential is otherwise called water potential (or) chemical potential. The water potential of pure water at 25°C is zero. When a solute (sugar or salt) is added to pure water, the water potential is decreased and it becomes negative as the free energy decreases. Always water moves from a region of higher water potential to a region of lower water potential. The symbol for water potential is Ψ and the unit is pascal.


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5 responses to this post.

  1. Posted by aarthi on July 25, 2012 at 4:31 pm

    good! its very nice to recollect the things that we learned in our school days


  2. Posted by srishan on July 24, 2012 at 12:32 pm

    nice to have this…


  3. Posted by Karthi on July 21, 2012 at 10:19 am

    is the picture depicts osmosis or reverse osmosis?


  4. Posted by Sabyasachi samal on July 7, 2012 at 6:11 am

    Simply amazing….great work admin keep it up


  5. Posted by sadhana on July 5, 2012 at 12:17 pm

    i want this in tamil


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