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Speed of sound
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Unit of speed
Symbol speed of sound
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SI units 343 m·s-1
Imperial/US unit(s) 767.27 mph
Other unit(s) 666.74 knot

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Kilometre per second [km/s]
Metre per second [m/s]
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Mile per second
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Foot per second [ft/s]
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Speed of light [c]
Speed of sound
Human walk
Common snail

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

In dry air at 20 °C (68 °F), the speed of sound is 343 metres per second (1125 ft/s; 1235 km/h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s.

This article uses material from the Wikipedia article "Speed of sound", which is released under the Creative Commons Attribution-Share-Alike License 3.0.