Differences in this property are measured in the "static" form of one technique for calculating the molecular weight of a polymer.
Differences in this property are measured in the "static" form of one technique for calculating the molecular weight of a polymer. CatÂ·ions attached to dissolved plasma proteins may contribute to an increase in this quantity in the Gibbs-Donnan effect. The difference in one form of this quantity is multiplied by the reflection coefficient in the Starling equation. In another equation, this quantity is found by multiplying (*) molarity by the ideal gas constant, temperature, and the van't Hoff factor. The effects of this property are commonly visualized using two-halves of a dialysis tube and a semipermeable membrane. For 10 points, name this colligative property describing the minimum pressure needed to prevent inward movement of a liquid across a membrane. 
Differences in this property are measured in the "static" form of one technique for calculating the molecular weight of a polymer.
osmotic pressure [or oncotic pressure; prompt on "pressure"; do NOT accept "hydrostatic pressure"] (The technique in clue one is molecular osmometry) 