Sound waves can make bubbles in levitated drops of liquid
The suspended pockets of air last for tens of minutes
![bubbles](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/09/091118_ec_bubbles_feat_free.jpg?fit=860%2C460&ssl=1)
BUBBLE UP Scientists can levitate liquid drops and turn them into bubbles by bombarding them with sound waves.
Chris W./Flickr (CC BY 2.0)