Sound barrier

A Spitfire PR Mk XI (PL965) of the type used in the 1944 RAE Farnborough dive tests during which a highest Mach Number of 0.92 was obtained

The prototype Miles M.52 turbojet powered aircraft, designed to achieve supersonic level flight.

Chuck Yeager in front of the Bell X-1, the first aircraft to break the sound barrier in level flight.

The sound barrier or sonic barrier is a popular term for the sudden increase in aerodynamic 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.

单词	Sonic barrier
释义	Sonic barrier 英语百科 Sound barrier The sound barrier or sonic barrier is a popular term for the sudden increase in aerodynamic 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.
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Sonic barrier

Sound barrier