Speed of sound
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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, the s
An F/A-18 Hornet displaying rare localized condensation at the speed of sound
Mach number
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The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after Austrian physicis
Speed of sound
…the speed of an object moving through the medium. The ratio of the speed of an object to the speed of sound (in the same medium) is called the object's Mach number. Objects moving at speeds greater than the speed of sound (Mach1) are said to be traveling at supersonic speeds. The Pythagorean Archytas taught that…
An F/A-18F Super Hornet creating a vapor cone at transonic speed just before reaching the speed of sound.