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Example 1.0.10
Cartesian diver
Accessories: plastic container, dropper, plastic bottle
 1. Fill the bottle with water and put the bottle into a container |
 2. Put the dropper into bottle so that its rubber is above. |
 3. Close the bottle tightly with the cap. |
 4. Take the bottle from the container and put it on the table. |
 5. Slowly and carefully squeeze bottle. Eyedropper goes down if you squeeze the bottle enough. If you like, you can repeat the experiment with a larger bottle. |
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Explanation 1: Dropper filled with air is floating, because air is easier than water. When the plastic bottle is compressed, the dropper is filled with water and thus becomes heavier and it sink to the bottom. An experiment was named after the French philosopher, mathematician and physicist by the name of René Descartes du Perron Cartesius. |
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Explanation 2: The dropper is composed of rubber, glass and air that is trapped in the glass tube. The average density of the dropper is less than the density of water, hence the dropper floats in water. All things with lower density as is density of water, float on water. By squeezing the bottle, the pressure is increased and push the water into the dropper. The average density of the dropper is now higher than the density of water. The dropper goes down. An experiment was named after the French philosopher, mathematician and physicist by the name of René Descartes du Perron Cartesius. |
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