Fast military jets have their top speed listed as a Mach number with Mach 1 being the speed of sound, and Mach 2 is twice the speed of sound.Īn aircraft that is travelling at supersonic speed is exceeding the speed of sound (Mach 1). If an aircraft is travelling at the speed of sound at sea-level then its speed will be 661 knots (760 miles per hour) or if it is travelling at the speed of sound at 30,000 feet then its speed will be 589 knots (677 miles per hour).Īircraft speed is usually measured in knots which is a unit of speed equal to one nautical mile per hour. In Helium, for example, the speed of sound is much higher (about 973 m/sec.) - which is why people who breath a mixture of oxygen with helium, sound high pitched.
At 20 ☌ (68 ☏), the speed of sound in air is about 343 metres per second (1,125 ft/s 1,235 km/h 767 mph 667 kn), or one kilometre in 2.9 s or one mile in 4.7 s. At an altitude of 40,000 feet, it decreases to about 295 m/sec. The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. The speed of sound in air at sea level moves about 1 mile every 5.
Celsius, the speed of sound is 340.3 m/sec. Thunder travels at the speed of sound and has a value of about 340 meters per second. The speed of sound (Mach 1) varies with altitude and temperature. In air at sea level and a temperature of 15 deg.
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