Produced by the Institute of Physics, this Physics to Go video shows a short demonstration in which a ball is kept in the air using only a hairdryer. The upward pressure from the hairdryer balances the downward force of gravity, keeping the ball 'levitating'.
The more impressive part of this trick is being able to move the ball on an angle. This relies on the difference in the pressure of moving and still air - the Bernoulli principle.
The teachers' notes include the equipment needed, tips and contain a full explanation of the physics involved.
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