Scientists at the U.S. Department of Energy’s Argonne National Laboratory have developed a system for levitating individual droplets of liquid using sound waves. Two speakers are positioned opposite one another and used to create a standing wave in the air between. When the drops of liquid are placed into the system, they fall into the nodes of the standing wave. If the acoustic pressure is strong enough, the drops of liquid will remain “stuck” in the nodes of the standing wave and levitate in the air.
Source: https://youtu.be/669AcEBpdsY
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