Sound waves can make these particles dance in the air | Science News

Unlike other devices that could levitate only one object or move around particles as a group, a new device (left) uses ultrasonic waves to independently steer up to 25 millimeter-sized particles in different directions simultaneously (shown here manipulating six foam balls). The device (shown in a computer simulation on the right) uses two grids of ultrasonic speakers (rainbow-colored dots at top and bottom) to create sound fields between the speaker arrays. In these sound fields, particles get trapped in relatively quiet regions (black) between regions of high intensity sound (white).

Read more: https://www.sciencenews.org/ar....ticle/these-sound-wa

Video: Asier Marzo, Bruce Drinkwater 2018