CD hovercraft

This simple experiment shows how you can make a floating CD using ordinary tools.

01:15

Physics

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Here is what you need, a sports cap , superglue, a CD, card stock, scissors, compass, a balloon, Poke a few holes in the top centre of the sports cap, Glue the sports cap to the centre of the CD, Cut two slits on a piece of card stock, Blow up the balloon, Twist the balloon, Pull the twisted part of the balloon throught the card stock ring, Pull the opening of the balloon over the sports cap, Set it on a flat surface and untwist the balloon, What do you think?, Why is the balloon floating?
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