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02-06-2015, 09:44 PM
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Sound Barrier or Sonic Barrier
The sound barrier or sonic barrier is a popular term for the sudden increase in drag and other effects experienced by an aircraft or other object when it approaches supersonic speed. When aircraft first began to be able to reach close to supersonic speed, these effects were seen as constituting a barrier making supersonic speed very difficult or impossible.[3][4] In dry air at 20 °C (68 °F), the sound barrier is reached when an object moves at a speed of 343 metres per second (1,125 ft/s). The term came into use in this sense during World War II, when a number of aircraft started to encounter the effects of compressibility, a number of several unrelated aerodynamic effects that "struck" their aircraft like an impediment to further acceleration. By the 1950s, new aircraft designs routinely "broke" the sound barrier.[N 1] |