Communicating Capillary Tube Set

Demonstrate that capillary rise varies according to the inner diameter of a tube.
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Use this tube set to demonstrate that capillary rise varies according to the inner diameter of a tube, and that the molecules of a liquid are more attracted to glass than to other liquid molecules.

Age: 10+ this is not a toy, it is made of fragile glass

What You Get

Four glass capillary tubes, each with a different inner diameter, connected to a large tube serving as the liquid reservoir. All mounted on a stand, with a total height of 150mm. How Does It Work? Capillary action occurs because of intermolecular forces between the liquid and surrounding solid surfaces. If the diameter of the tube is sufficiently small, then the combination of surface tension (cohesion within the liquid) and adhesive attraction between the liquid and container act to lift the liquid.

In short, the capillary action is due to the pressure of cohesion and adhesion which cause the liquid to rise against gravity.


  • Capillary action
  • Surface tension

WARNING: CHOKING HAZARD - Small Parts. Not for children under 3 years.

More Information
Length (cm) 18
Width (cm) 10
Height (cm) 23
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