Researchers from Brazil and the UK have been able to levitate a 50-mm (2-in) solid polystyrene sphere using acoustic waves. These waves have been used before to levitate objects. However, they did have a threshold. The objects’ size, at most, was a quarter of the wavelength of an acoustic wave. This is also the first spherical object levitated acoustically; the earlier objects were wire-like or planar in shape. For the types of waves the researchers are using, ultrasound waves with a frequency above 20 kHz, the maximum size should be at 4mm.
~ https://futurism.com/physicists-successfully-levitate-large-objects-with-sound-waves (https://futurism.com/physicists-successfully-levitate-large-objects-with-sound-waves)
Cool, but I don't see this being terribly useful for moving anything delicate, or living.
Wonder if it's possible with any material object or if it's only certain kinds. Pretty interesting regardless.
Interesting post. Thanks for sharing!