You will need:
- Cardboard or plastic cylindrical box which is
open on one end - Scissors
- Tape
- Plastic or plastic bag
Even though this experiment seems simple, it explains yet another amazing phenomenon in physics known as toroid vortex which is a result of fluid dynamics.
INSTRUCTIONS
- Firstly, cut a small round hole in the centre of the base of the cylindrical box.
- Take a clear plastic and tape over the opposite end of the box, which is open.
- Make sure to tape it well so that no air may escape from that side.
- Cut a piece of tape and tape it in the centre of the plastic in such a manner as to create a handle. Fold the tape in half, and stick the edges on the plastic.
- Focus the small opening side on a good target and slowly pull the plastic back by the tape handle.
- Push it towards the box quickly,
creating a burst of air out of the hole displacing the air outside.
RESULT
The burst of air displaces the air in the shape of a twisting doughnut. We all have seen swirl-like vortices, in sinks and bathtubs. But this unique swirl in the shape of an outward twisting doughnut is known as a toroid and this type of vortex can carry the original burst of air at least 50 feet away.
