WORLD WATER DAY -SCIENCELANDIA

Time

Mar 22, 2024 11:00 AM Bucharest

Passcode

eTwinning2

he experiment with two bottles joined together to form a tornado in the bottle is an engaging way to illustrate the movement of fluids in a vortex. Here's how you can perform this experiment:

Materials required:

Two transparent bottles with narrow necks.

Coloured water (optional, to make the swirl more visible).

A device to join the bottles, such as a bottle connector or flexible tubing (such as silicone tubing or a garden hose cut to size), is needed.

The water.

Instructions:

Make sure both bottles are clean and dry.

Fill one of the bottles with water. You can add a few drops of food colouring to make the swirl more visible, but this is optional.

Join the two bottles using the bottle connector or flexible tube. Make sure the connection is tight.

Swirl both bottles in a quick circular motion. The rotation must be fast enough to create a significant pressure difference between the bottles' centre and edges.

Notice how the water in the bottle begins to form a vortex inside the connected bottle.

Explanation:

When you spin the bottles, the rapid circular motion creates a pressure difference between the centre and the edges. The lower pressure in the centre allows the water to flow downwards, forming a vortex. This vortex is an example of the Coriolis effect, an apparent force caused by the Earth's rotation that affects the motion of fluids. In this case, the movement of the liquid (water) is influenced by the rotation of the bottles, creating a vortex inside them.