Preferred Label : osmotic pressure;
Detailed label : osmotic pressure, Π;
IUPAC definition : Excess pressure required to maintain osmotic equilibrium between a solution and the
pure solvent separated by a membrane permeable only to the solvent: \[\mathit{\Pi}
-\frac{R\ T}{V_{{A}}}\ \ln a_{{A}}\] where V A, aA are the partial molar volume and
activity of solvent A for an incompressible fluid. For ideal dilute solutions, Π
c B R T ρ B R T M B, where entities B are individually moving solute molecules,
ions, etc., regardless of their nature, cB, ρ B are the amount and mass concentration
of the solutes, and M B is the mass average molar mass of the solutes. The amount
is sometimes expressed in osmol (meaning a mole of osmotically active entities), but
this usage and the corresponding term osmolarity are discouraged.;
Origin ID : O04344;
Automatic exact mappings (from CISMeF team)
- See also
Excess pressure required to maintain osmotic equilibrium between a solution and the
pure solvent separated by a membrane permeable only to the solvent: \[\mathit{\Pi}
-\frac{R\ T}{V_{{A}}}\ \ln a_{{A}}\] where V A, aA are the partial molar volume and
activity of solvent A for an incompressible fluid. For ideal dilute solutions, Π
c B R T ρ B R T M B, where entities B are individually moving solute molecules,
ions, etc., regardless of their nature, cB, ρ B are the amount and mass concentration
of the solutes, and M B is the mass average molar mass of the solutes. The amount
is sometimes expressed in osmol (meaning a mole of osmotically active entities), but
this usage and the corresponding term osmolarity are discouraged.
