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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.
Those physical properties and the speed of sound change with ambient conditions. For example, the speed of sound in gases depends on temperature. In 20 °C (68 °F) air at sea level, the speed of sound is approximately 343 m/s (1,230 km/h; 767 mph) using the formula v [m/s] = 331 + 0.6 T [°C].
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). An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound. The local speed of sound, and hence the Mach number, depends on the temperature of the surrounding gas.
where is the Laplace operator, is the acoustic pressure (the local deviation from the ambient pressure), and is the speed of sound. A similar looking wave equation but for the vector field particle velocity is given by
The speed of sound in any chemical element in the fluid phase has one temperature-dependent value. In the solid phase, different types of sound wave may be propagated, each with its own speed: among these types of wave are longitudinal (as in fluids), transversal, and (along a surface or plate) extensional. [1]
“The mass of the Ford F-350 and its extreme speed imposed such a forceful impact upon the Solara that it ripped and mangled it to pieces.” 100 mph Roseville police chase caused head-on crash ...
Ukraine is making a new drone called Sting that flies faster than 100 mph to kill Russia's Iranian Shahed drones ... to fly faster than 100 miles per hour at an altitude of about 10,000 feet ...
= / is the wave number while is the sound speed. Note that the transmission loss is zero when l {\displaystyle l} is a multiple of half a wavelength. As a simple example, consider a one chamber silencer with h = S1 / S2 =1/3, at around 400 °C the sound speed is about 520 m/s, with l =0.5 m, one easily calculate the TL result shown on the plot ...