Acoustic Levitation (IMAGE) Optica Caption Researchers used sound waves to levitate droplets of water. This approach allows the water to evaporate, which concentrates the sample for spectroscopic detection of harmful heavy metal contaminants such as lead and mercury in water. Credit Jairo Peralta and Victor Contreras, Instituto de Ciencias Físicas UNAM Usage Restrictions None 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.