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| Make a Ball Float on Air |
Make a Ball Float on Air
This contraption demonstrates what physicists call the Bernoulli effect, which also explains how the wings of airplanes provide lift. But kids will just call the hovering ball amazing.
What you'll need
1-liter plastic bottle
hair dryer with a "cool" or "cold" setting*
cardboard box a few inches taller than the hair dryer
duct tape
craft knife (adults only)
table-tennis ball
Full post: Make a Ball Float on Air (Source)
