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A transportation barrier is a natural barrier like mountains, rivers, oceans, etc that blocks or slows the way of transportation.
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. In dry air at 20 Â°C, the sound barrier is reached when an object moves at a speed of 343 metres per second. The term came ...