Osmosis and Osmotic Pressure - 1

In this model a semipermeable membrane separates the two sides of a u-shaped tube.

The right side has a sugar solution. Because water always flows from high potential (pure water) to lower potential (the hypertonic sugar solution), the level on the right side rises and pressure (osmotic) increases.

The sugar molecules are too large to pass through the semipermeable membrane.


water moves freely through the semipermeable membrane

Click next page to see how plants can use this system to circulate sap.