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Answered 2009-05-07 12:43:47

They are filled with air, which is lighter than water so it goes to the surface, like a bubble and has a rope with an anchor attached to it making it stay in place and not move.

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Can you make a coin float on water?

An aluminum coin (for example the 1 yen coin) will float on water due to the surface tension of water.

Will a paper clip float in water?

No, it isn't hollow/light enough... Improving answer: But sometimes things don't actually "float" on the water when they are really held up by surface tesion. I have heard that you can make paper clips or pins "float" on the surface of calm water.

How can you make a compass with a needle magnet and water in a container?

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Can you make aluminum float in water?