![]() ![]() At 35,000 feet, this could be reduced to around 295 meters per second (660 mph or 1062 kph). Eventually they merge into a single shock wave, which travels at the speed of sound, a critical speed known as Mach 1, and is approximately 1,127 km/h (700 mph) at sea level and 20 ☌ (68 ☏). At sea level and in standard atmospheric conditions, the speed of sound is 345 meters per second (equivalent to 770 mph or 1239 kph). The speed of sound in dry air at 20 C is 343 m/s and the lowest frequency sound wave that the human ear can detect is approximately 20 Hz. Speed of Sound in Various Units The speed of sound is measured in the following units: Speed of sound in Km per hour - 1,235 Kmph Speed of Sound in miles per hour - 767 mph Speed of sound in air feet per second - 1,125 ft s¹ The velocity of sound is measured in hydrogen and oxygen (H2 and O2) is always 332 m/s. At a temperature like 28 degrees C (82 degrees F), the speed is 346 meters per second. ![]() This is because the speed of sound changes with altitude and temperature. The sonic boom occurs as the aircraft reaches the speed of sound, or Mach 1, relative to the surrounding air - not measured in ground speed. However, when the speed increases, the impact on the ground lessens as the 'cone' of the shockwaves tightens. Despite its name, it is not a one-off bang, but rather it is continuous, trailing the aircraft. This loud noise has been a severe limitation for supersonic aircraft, with many countries (including the US) not permitting supersonic flight over land.Ī sonic boom is actually a shock wave that is produced when an object, in this case, an aircraft, travels faster than the speed of sound. On a standard day at sea level static conditions, the. The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior. The speed of sound in an ideal gas depends only on its temperature and composition. Speed of Sound in Various Units The speed of sound is measured in the following units: Speed of sound in Km per hour - 1,235 Kmph Speed of Sound in miles per hour - 767 mph Speed of sound in air feet per second - 1,125 ft s The velocity of sound is measured in hydrogen and oxygen (H2 and O2) is always 332 m/s. More simply, the speed of sound is how fast vibrations travel. The speed of sound through the atmosphere is a constant that depends on the daily temperature. At 0 C (32 F), the speed of sound in air is about 331 m/s (1,086 ft/s 1,192 km/h 740 mph 643 kn). ![]() Sound is a sensation created in the human brain in response to sensory inputs from the inner ear. One of the features of supersonic flight is the 'sonic boom' that occurs when the aircraft exceeds the speed of sound. The speed of 'sound' is actually the speed of transmission of a small disturbance through the gas. ![]()
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