Goodna State School - Bottle Divers

Goodna State School Science - Why does the Bottle Diver dive?
When you squeeze sides of the bottle, you increase the pressure inside the bottle. The water and the air trapped in the eyedropper are pressurised identically. However the air will compress but the water does not. This allows water to enter the eyedropper, which makes it heavier: it contains the same amount of air as before, but also an added amount of water. When the weight of the eyedropper increases sufficiently, it will sink. When the pressure is released, the air expands, pushing the water out, and making the eyedropper lighter, causing it to float. The cycle can be repeated any number of times.

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