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Sound Barrier

     11th July' 2009

In aerodynamics, the sound barrier usually refers to the point at which an aircraft moves from transonic to supersonic speed. The term came into use during World War II when a number of aircraft started to encounter the effects of compressibility, a grab-bag of unrelated aerodynamic effects. By the 1950s, aircraft started to routinely "break" the sound barrier. The white halo is formed by condensed water droplets which are thought to result from a drop in air pressure around the aircraft.

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