Acoustic Levitation of Particles (2 of 3) (IMAGE) American Institute of Physics Caption This shows levitation of an expanded polystyrene particle by ultrasonic sound waves. Credit M. Andrade/University of São Paulo Usage Restrictions This image may be used only with appropriate caption and credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.