When it comes to levitation, most of the time it is achieved magnetically. For smaller objects, it is possible to use high frequency sound waves to defy gravity. There are multiple versions of this available for sale that you can use for science demonstrations to your students or to impress your friends. We recently had the chance to compare two of them:
More gadgets like this: here
2 Ultrasonic Acoustic Levitators: Levitating Objects with Sound 😵 Gadgetify
These acoustic levitators emit sound waves above 20kHz, so you will only hear a very small noise. The reflector and transducer bounce the waves back and forth to form a standing wave. You will be able to levitate objects at points where acoustic radiation force balances gravity. These acoustic levitators can handle tiny pieces of paper, water drops and tiny insects.
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