Levitation. At its best, the word brings up images of a sci-fi future; at its worst, it evokes memories of weird street magicians. But in fact, levitation is here, now. The most promising version of it may be acoustic levitation: using sound to make objects float in the air.
Floating On A Sound Wave
A World Of Possibilities
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Key Facts In This Video
Two identical sound waves projecting in opposite directions can create a standing wave, which has neutral areas that don't oscillate. 01:22
Acoustic levitation "floats" objects in the neutral areas of a standing wave. 01:43
Water droplets undergoing acoustic levitation will explode when the amplitude of sound is increased beyond a certain threshold. 03:42