Osmotic pressure

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Osmotic pressure - is the difference in the pressure between two solutions that prevent fluid flow through semi-permeable membrane [1]

Osmotic pressure occurs when two solutions separated by semipermeable membrane have different concentrations of solutes. According to a rule of osmosis, fluid moves from an area of low concentration of solutes to an area of high concentration [2]

Osmotic pressure can be calculated using the following formula [3]:

        ∏ = nRT/V = MMRT

Where:

  • n - the number of moles of solute present
  • R - ideal gas constant 
  • T - temperature in Kelvin
  • V - volume of the solution
  • MM - molar mass of the solute

References

  1. Alberts B, Johnson A, Lewis J, et al. (2002) Molecular Biology of the Cell. 4th edition. New York: Garland Science.
  2. Kent, M. (2000) Advanced Biology. Oxford: Oxford University Press.
  3. Alberts B, Johnson A, Lewis J, et al. (2002) Molecular Biology of the Cell. 4th edition. New York: Garland Science.