One note of caution: There is one step in the project that requires a lighter to seal the ends of the straw. YOU should do this quick step for the kids :)
And of course... Have Fun!!
How to Make a Spinning Cartesian Diver
from wikiHow - The How to Manual That You Can Edit
With this variation of the Cartesian diver, you can put two of them in the same bottle and they'll spin in synchrony like little underwater dancers! This Cartesian diver can also demonstrate the principle of buoyancy (Archimedes’ principle) and the ideal gas law.
Steps
- Bend a straw into a "J" shape.
- Cut the straw so that the length of the left and right is same.
- Insert the straw through the washer so that the washer rests on the bendy part.
- Pinch the ends together with pliers.
- Hold up a flame to the ends so that they are sealed together.
- Make two holes with a pin, as shown in the images.
- Drop the straw into a glass of water.
- Adjust the buoyancy by squeezing it so that the straw sucks up water through the pin holes. That'll make it sink a little. You want it so that about 5-10mm of the straw is barely above the water.
- Repeat all of these steps to make a second Cartesian diver.
- Put both divers in a bottle of water.
- Screw on the bottle cap tightly. The seal must be airtight.
- Grasp a bottle and experiment with squeezing it and loosening your grip. When this movement is repeated, the straws will spin as they go up and down.
Videos
Tips
- In Japan, making a spinning Cartesian diver is an activity used to aid rehabilitation of the hands of senior citizens.
- Squeezing the bottle compresses the air in the diver and also pushes a little water into the pinholes. When the bottle is released, the air in the diver expands and some of the water is expelled. The diver floats again (because it is now less dense since the air within has expanded) and the straw spins because water is expelled through the pinholes on either side, just as a rocket ship moves by expelling burning fuel.
Warnings
- Don't cut your finger!
- Don't get burned!
Things You'll Need
- Flex straws
- Washers (stainless)
- Pair of scissors
- Radio pliers
- Lighter
- Marking pin
- Glass of water
- Plastic bottle
(NOTE:
Follow the link below to the original article to view the pictures. For some reason they don't "follow" when the article is embedded somewhere else - Spinning Cartesian Diver Original Article)
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[edit] Sources and Citations
Article provided by wikiHow, a wiki how-to manual. Please edit this article and find author credits at the original wikiHow article on How to Make a Spinning Cartesian Diver.
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