Levitating Rocks with Sound: Acoustic Levitation [VIDEO]
Acoustic levitation is a method of suspending an object, no matter its size, in the air using acoustic radiation pressure from high intensity sound waves.
It works on the same principles as acoustic tweezers by harnessing acoustic radiation forces. However acoustic tweezers are generally small scale devices which operate in a fluid medium and are less affected by gravity, whereas acoustic levitation is primarily concerned with overcoming gravity. Technically dynamic acoustic levitation is a form of acoustophoresis, though this term is more commonly associated with small scale acoustic tweezers.
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