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890.80 feet per second is about four-fifths as fast as The Speed of Sound
In other words, it's 0.792 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.26 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1,130 feet per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 4,910 feet per second to 5,120 feet per second in water, depending on its salinity.
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