Description
Launching Invisible Tornadoes!
The Airzooka doesn’t simply blast air forwards. It launches a spinning vortex ring—a doughnut-shaped ring of air that can travel several metres while holding its shape.
Although the air is invisible, adding a little smoke allows you to see the amazing vortex as it flies through the air.
How does it work?
When you pull back the stretchy membrane at the back of the Airzooka, the chamber fills with air.
As you let go, the membrane snaps forward, forcing a large volume of air out through the circular opening.
This diagram shows how an Airzooka transforms a short burst of air into a stable vortex ring. As the air leaves the opening, it curls around the edges to form a spinning doughnut-shaped ring that can travel several metres while carrying energy through the air.
As the air rushes through the opening, the air touching the edge slows down slightly because of friction, while the air in the centre continues moving faster. This difference makes the air curl back on itself, creating a spinning ring called a vortex ring.
The spinning motion continually pulls the air around the ring, helping it remain stable as it travels through the air.
Think of it as an invisible smoke ring. Add a little smoke and suddenly you can see the spinning vortex racing across the room!
What is a vortex?
A vortex is a region where a fluid (either a liquid or a gas) spins around a central axis. Examples include:
Discover how vortexes appear throughout nature—from tornadoes and whirlpools to jellyfish, squid, your heart and even global weather systems. The Airzooka demonstrates the same fascinating science using invisible rings of air.
Although these all look very different, they are all examples of spinning fluids following the same laws of physics.
Why does it travel so far?
The vortex has two kinds of motion working together.
Linear momentum carries the vortex forwards in a straight line.
At the same time, the spinning air has angular momentum, which helps the vortex keep its shape instead of immediately breaking apart.
Together these two motions allow the vortex ring to travel much farther than an ordinary puff of air.
A well-made vortex can travel several metres and still have enough energy to knock over paper cups, move lightweight objects or even extinguish a candle.
Try these investigations
Can you see the invisible air?
Fill the Airzooka with smoke from a smoke machine and launch a vortex ring across the room. Can you watch the spinning ring travelling in a straight line before it slowly disappears?
Can you watch the complete vortex ring travelling through the air?
Cup Challenge
Build a pyramid of paper cups. Aim your Airzooka directly at the centre of the pyramid. How many cups can you knock over with a single vortex ring?
Candle Challenge
Line up a row of lit tea light candles. Take careful aim with your Airzooka and fire one invisible vortex ring. Can you blow out every candle with a single blast? Record the greatest number of candles you can extinguish.
🌸 Fragrance Flight Challenge
Give the inside of your Airzooka one quick spray of a scented body spray or air freshener.
Ask a volunteer to stand several metres away. Aim carefully and launch a single vortex ring.
Can they smell it?
Investigate:
- How far can you transport a scent with one vortex ring?
- What is the greatest distance at which the fragrance can still be detected?
Science Behind the Challenge
A vortex ring traps a pocket of air and carries it through the room. Instead of the fragrance simply spreading in all directions, the scented air travels inside the invisible ring, allowing it to reach someone several metres away.
Safety First: Use only one quick spray and avoid this activity if anyone nearby has asthma, allergies or sensitivity to fragrances. Never aim the Airzooka directly at a person’s face or eyes.
