Acoustic levitation results when a small object is placed into the node of a standing wave—an area where the acoustic pressure is almost zero. The technology enables scientists to work with materials that might crystallize or become contaminated upon contact with containers.
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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