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Definition of SOUND BARRIER. : a sudden large increase in aerodynamic drag that occurs as the speed of an aircraft approaches the speed of sound.See sound barrier defined for English-language learners.See sound barrier defined for kids. ADVERTISEMENT. a sudden large increase in aerodynamic drag that occurs as the speed of an aircraft approaches the speed of sound. See sound barrier defined for English-language learners. See sound barrier defined for kids.
In dry air at 20 Â°C (68 Â°F), the sound barrier is reached when an object moves at a speed of 343 metres per second (about 767 mph, 1234 km/h or 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 unrelated aerodynamic effects that struck their aircraft, seemingly impeding further acceleration.