Ultrasonic anemometers measure wind speed by utilizing ultrasonic sound waves. They consist of two or more pairs of transducers that emit and receive sound waves between them. As the wind blows past ...

The engineers were able to measure the speed of sound on Mars by calculating the time it took for the laser-induced acoustic sound to reach Perseverance's microphone. The laser is mounted about 2.1 ...

The fastest possible speed of sound — 22.4 miles per second, nearly twice its speed in air at the Earth's surface — has been calculated for the first time.