New method of measuring the speed of sound in liquids could lead to safer drinking water

The instrument is designed to analyze the quality of liquids using the photoacoustic effect, or the generation of sound waves after light is absorbed in a material. Drops of sea water, dairy milk or ionic liquids, a class of molten salt, were used in the study. The MU scientists believe this might be the first use of this technology to analyze such small liquid samples.

https://munews.missouri.edu/news-releases/2019/0708-liquid-forensics-could-lead-to-safer-drinking-water-mu-study-finds/

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