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At sea level, sound travels though the air at around 340 m per second, and slightly slower at high altitudes. The denser the substance, the faster sound will travel through it. Sound travels at 1,500 m per second through water, for example. When travelling at such very high speeds, an aircraft begins to build up a huge wave of compressed air in front of it.

This was known as the sound barrier because it was an obstacle to high-speed flight. When the aircraft exceeds the speed of sound, it le read more...

Tags: sound, travel

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