| 21. | Humidity has a comparatively small effect on the speed of sound.
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| 22. | The aircraft exceeded the speed of sound during its maiden flight.
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| 23. | Those engines allow the plane to travel at twice the speed of sound.
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| 24. | The armor works; many black boxes survive impacts at the speed of sound.
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| 25. | Concorde's demise ends an era of Champagne at twice the speed of sound.
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| 26. | Pure turbojets were found to fly little faster than the speed of sound.
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| 27. | Shock waves move through the air at the speed of sound.
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| 28. | Thrust is after the world land speed record and the speed of sound.
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| 29. | Yeager, became the first person to fly faster than the speed of sound.
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| 30. | Some textbooks mistakenly state that the speed of sound increases with increasing density.
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