Web Results
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 20 °C (68 °F), the speed of sound is 343 metres per second (1,125 ft/s; 1,235 km/h; ...

.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.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.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 ...

www.sciencedaily.com/terms/speed_of_sound.htm

Humidity has little effect on the speed of sound, nor does air pressure by itself. ... normal atmospheric conditions, the speed of sound is 344 m/s (1238 km/h or ...

www.fighter-planes.com/jetmach1.htm

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

www.translatorscafe.com/unit-converter/en/velocity/4-29/kilometer%2Fhour-Speed%20of%20sound%20in%20pure%20water

kilometer/hour to Speed of sound in pure water (km/h—) measurement units conversion.

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

Easily convert mach (speed of sound) to miles per hour, convert Ma to mph . ... second per kilometer (sec/km) · second per 100 meters (sec/hm) · minute per mile  ...