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Cartesian Diver

Make the diver descend by squeezing the bottle. Just like a submarine!

Cartesian Diver
See the diver at the bottom?
Cartesian Diver

pipets
You can get these disposable pipettes cheap. Just search for 3 ml (milliliter) pipettes. All you need is a 3 ml pipette, a 1/4 inch nut and a water bottle.
Illustrated Instructions (PDF)
Sample Lesson Plan (English)
Sample Lesson Plan (Spanish)
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