Viscosity density

Device description:

The exhibit consists of a steel structure, three liquid tanks and an air supply mechanism.


The pipes contain liquids of different densities and viscosities. In the pipe with the highest density liquid there is glycerin, in the next there is a mixture of glycerin and water, in the last one water which has the lowest density. By pulling the stick, you let air into the liquid, which can be seen in the form of bubbles moving up. The forces associated with the surface tension of the liquid cause the air bubbles to take the shape of a sphere. If the ball moves in a denser liquid, high resistance to motion can distort it. In liquids of higher density, where resistance to motion is the highest, the velocity of air bubbles is the lowest. The participant's task is to use a stick to introduce air into each of the tanks, and then observe the density dependencies.

How to perform an experiment?

Pull the rods on the device one by one and observe the liquids in the pipes. Observe the size, shape and speed of the emerging objects.