Levitation Made Possible By Sound

The device is built of two facing platforms made up of sound-emitting squares that trap the substances between them. The sound waves move upward until they reach the surface lying above, whereupon they bounce back. When upward and downward-moving waves overlap, they cancel out and trap materials in place.

This requires extremely powerful sound to levitate even a tiny droplet of water, so the researchers have worked with ultrasound - frequencies beyond those that human ears can detect - to avoid damaging their hearing.

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