This quantity times the volumetric flow rate through an RO membrane gives the power required for industrial (*)  desalination.
In the Donnan effect, this quantity seems larger than it actually is because of an electrostatic potential. The main reason cells store glucose as glycogen is to minimize this quantity. A classic method of determining molecular weights measures this quantity for a polymer solution. This quantity times the volumetric flow rate through an RO membrane gives the power required for industrial (*)  desalination. It equals the van 't Hoff factor times molarity times  RT  in the Morse equation, and is zero between isotonic solutions. This quantity, symbolized uppercase pi, is the difference in fluid height between the two halves of a dialysis tube. For 10 points, name this colligative property, which is the number of pascals required to prevent water from diffusing through a membrane.
In the Donnan effect, this quantity seems larger than it actually is because of an electrostatic potential.
osmotic pressure  [or uppercase  pi  until it is read; prompt on  pressure ; prompt on  turgor  pressure]