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A Cartesian Diver is a physics demonstration that is a fun activity to learn a certain concept of science.
It's can also be used to perform a cool trick towards children to teach them a misconception of how the experiment actually works.
To start the project you will need the following; water bottle with a cap, water, and a plastic eye dropper with a bolt at the end or a simple glass eye dropper.
To begin the demonstration you must first fill the water bottle up with water, but don't close it just yet! Take the eye dropper and squeeze it at the top of the water bottle to absorb some water inside. Then simple drop the eye dropper inside of the water bottle and then close the bottle well. After closing the bottle place your hand at the bottom on the bottle either at the bottom or the middle. Press your fingers upon the water bottle and hold. Examine the eye dropper as it should begin to sink, as you are still pressing on the bottle. When you release you grasp on the bottle the eye dropper will return to the top.
Now I bet your wondering ",How did I do that?" Well obviously there was not magnet in your hand. The Cartesian Diver uses the principle of atmospheric pressure and demonstrates the property of buoyancy.
The water inside of the bottle weighs more that the eye dropper and the water inside it. Also meaning that the water is more dense.
When you press your fingers to the water bottle you are applying pressure to the bottle, this also makes the eye dropper more dense than the water surrounding it. In terms of buoyancy adding pressure also reduces the air bubble in the eye dropper and helps it sink.
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