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955 mach is about 900 times as as The Speed of Sound.
In other words, it's 923 times the of The Speed of Sound, and the of The Speed of Sound is 0.00108 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1.03 mach. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 4.52 mach to 4.71 mach in water, depending on its salinity.
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