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The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air, is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.
Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level , this speed is approximately 343.2 m/s (1,126 ft/s; 768 mph; 667.1 kn; 1,236 km/h).
The X-43 is the fastest jet-powered aircraft on record at approximately Mach 9.6. [2] ... Jet turbines or rockets would initially propel the vehicle to supersonic speed.
The fastest speed the XB-1 had reached prior to the January 28 flight was Mach 0.95, just below the supersonic threshold of Mach 1, which it hit during its last test flight on January 10.
NASA used the pre-production XB-70 triple-sonic bomber prototype for high-speed research in the. 1960s. - NASA
Boom's Supersonic XB-1 jet became the “world’s first independently developed supersonic jet” to break the sound ... This means XB-1 traveled at a rate 0.122 faster than the speed of sound.
c is the speed of sound in the medium, which in air varies with the square root of the thermodynamic temperature. By definition, at Mach 1, the local flow velocity u is equal to the speed of sound. At Mach 0.65, u is 65% of the speed of sound (subsonic), and, at Mach 1.35, u is 35% faster than the speed of sound (supersonic).
Supersonic aircraft are any aircraft that can achieve flight faster than Mach 1, which refers to the speed of sound. "Supersonic includes speeds up to five times Mach than the speed of sound, or Mach 5." (Dunbar, 2015) The top mileage per hour for a supersonic aircraft normally ranges from 700 to 1,500 miles per hour (1,100 to 2,400 km/h).