For 10 points, name this quantity symbolized pi, equal to the force necessary to stop the movement of water across a semipermeable membrane.
The difference of this quantity is multiplied by the reflection coefficient in one term of the Starling equation, and this quantity can be measured using a Pfeffer cell. An easy method of decreasing this quantity in cells is to activate the brancher enzyme to polymerize glycogen. This phenomenon is often measured using a U-shaped tube demarcated by dialysis membrane, and this quantity is the reason why putting a (*) red blood cell in pure water causes it to swell and burst. This quantity is equal to the ideal gas constant times temperature times the molarity times the van't Hoff factor, and like freezing point depression and boiling point elevation, it is a colligative property. For 10 points, name this quantity symbolized pi, equal to the force necessary to stop the movement of water across a semipermeable membrane.
The difference of this quantity is multiplied by the reflection coefficient in one term of the Starling equation, and this quantity can be measured using a Pfeffer cell.
osmotic pressure [accept oncotic pressure]