Taila made this at home and brought it to school for news.
How does it work?
This is what we call a vortex. A vortex is a type of motion and is created when the water falls through an opening of both bottles.
Gravity is the force that pulls the water down into the hole and the vortex looks like a tornado in the bottle. Look carefully and you can see the hole in the middle of the vortex that allows the air to come up inside the bottle.
To create a vortex you need to swirl the water. If you don't swirl the water there will be a glug-glug sound. That is because the air and water is taking turns to pass through the gap between both bottles.
Taila
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