Explore Air Pressure and Density!
Squeeze the soda bottle to manipulate Squidy’s buoyancy and watch it sink and float!
Everything is cooler when it’s glow-in-the-dark! Now the popular soda bottle science toy is available in glow-in-the-dark green. The Glow-in-the-Dark SQUIDY puts an eery spin on the cartesian diver as a ghastly, glowing squid sinks and floats inside of the bottle!
Squeeze the plastic soda bottle and SQUIDY swims up and down in the bottle of water.
How does it work?
The illustrated instructions show how to construct the Cartesian diver and explains the scientific principle behind its action.
What does it teach?
When you have the water levels adjusted correctly, you should see the water in the diver rise as you squeeze the bottle. The air trapped in the pipette compresses into a smaller space and the diver’s weight increases. It becomes less buoyant and it sinks. When you release the squeeze, the compressed air expands and forces water out of the diver, allowing it to float to the top of the bottle.