Sound waves can levitate objects, scientists discovered

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A region of low pressure created this way  effectively counteracts gravity. Three different acoustic force fields that can twirl, grab and manipulate objects were found after computer simulation research. They all are needed to produce a “tractor beam” because their action is complementary: the first works like tweezers and seems to grab the particles in thin air, the second traps the object in a high-pressure cage and the third acts a bit like a swirling tornado. The sound intensity determines the maximum density of an object that can be pushed and pulled by the acoustic force .The team demonstrated their tractor beam using tiny balls of polystyrene using sound waves operating between 140 and 150 decibels and 40 kilohertz, above the human hearing range but audible to dolphins and dogs.

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