___ ONE (SPEED OF SOUND) Crossword Clue
___ ONE (SPEED OF SOUND) Crossword Clue
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Crossword Puzzle Infos
The term 'MACH' is an acronym for the speed of sound, which is the speed at which sound waves travel through a medium such as air or water. It is named after the Austrian physicist Ernst Mach, who first measured the speed of sound in 1877. The speed of sound is approximately 1, 086 feet per second, or 661.7 miles per hour.