Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of soun... More » Science Physics Motion & Mechanics

On Oct. 14, 1947, Chuck Yeager became the first person to break the sound barrier. He flew a Bell X-1 rocket-plane, which was deployed over Rogers Dry Lake in southern California. More » Science Astronomy Space Travel

Diffraction occurs when a wave moves through an opening in a barrier. This causes the wave to change direction and spread out. More » Science Physics Optics & Waves
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The speed of sound in dry air is approximately 344 meters per second, or 770 miles per hour. This assumes dry air at sea level with a temperature of 68 degrees Fahrenheit. More » Science Physics Motion & Mechanics

Many jet air crafts are capable of routinely breaking the sound barrier, as well as a handful of land vehicles, such as the Thrust Super Sonic Car. Almost all military combat planes are capable of supersonic flight, thou... More » Science Physics Motion & Mechanics

The speed of sound is influenced by several factors, including medium, density and temperature. The rate at which sound waves moves varies widely from one situation to the next and can change dramatically in a short peri... More » Science Physics Motion & Mechanics

As of 2014, the fastest rocket ship, NASA's New Horizons spacecraft, was recorded at a speed of 36,000 miles per hour. The speed a spacecraft travels depends on if it is ascending, orbiting or returning to Earth. More » Science Physics Motion & Mechanics