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The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. For dry air at sea level at 68° F, the speed of sound is 767 miles per hour, or 1235 km/h

en.wikipedia.org/wiki/Speed_of_sound

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 0 °C (32 °F), the speed of sound is 332 metres per second (1,089 ft/s; 1,195 km/h; ...

www.ask.com/youtube?q=What+Is+the+Speed+of+Sound+in+Km+HR&v=llZwBVSTleI
Aug 14, 2012 ... Hypersonic X-51A X51a Wave Rider - u.s technology for future combat and commercial use (speed of sound - 1235km/hr) (speed of rifle bullet- ...

www.kylesconverter.com/speed-or-velocity/speed-of-sound-in-air-to-kilometres-per-hour

Instantly Convert Speed Of Sound In Air (s) to Kilometres Per Hour (km/h) and Many More Speed Or Velocity Conversions Online. Speed Of Sound In Air ...

convert-to.com/conversion/speed/convert-speed-of-sound-to-km-per-hour.html

This on the web one-way conversion tool converts speed and velocity units from speed of sound ( sea level ) into kilometers per hour ( km/h ) instantly online.

www.smh.com.au/technology/sci-tech/hypersonic-plane-to-fly-at-20-times-speed-of-sound-20120717-227l9.html

Jul 17, 2012 ... The US military aims to fly a hypersonic plane at 20 times the speed of sound by 2016. The X-plane will travel at Mach 20 (roughly 20,900 km/h) ...

www.livescience.com/37022-speed-of-sound-mach-1.html

May 31, 2013 ... The speed of sound through air or any other gas, also known as Mach 1, can ... Fahrenheit (15 degrees Celsius) — is 761.2 mph (1,225 km/h).

www.sciencedaily.com/terms/speed_of_sound.htm

The term is commonly used to refer specifically to the speed of sound in air. ... normal atmospheric conditions, the speed of sound is 344 m/s (1238 km/h or 770  ...

www.fighter-planes.com/jetmach1.htm

Speed of Sound (mach) at altitudes depends on temperature not air pressure.

www.unitjuggler.com/convert-speed-from-kmh-to-Ma.html

Convert speed units. Easily convert kilometers per hour to mach (speed of sound) , convert kph to Ma . Many other converters available for free.