Physicists clock the fastest possible speed of sound

Scientists have discovered the fastest possible speed of sound, a zippy 22 miles (36 kilometers) per second. 

Sound waves move at different speeds in solids, liquids and gases, and within those states of matter — for instance, they travel faster in warmer liquids compared with colder ones. Physicist Kostya Trachenko of Queen Mary University of London and his colleagues wanted to figure out the upper limits of how fast sound could travel. 

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