| 1. | No variation of density, speed of sound and Mach number is allowed.
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| 2. | He produced the earliest, reasonably accurate estimate of the speed of sound.
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| 3. | Some hard disks now run at just under the speed of sound,
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| 4. | -- Air speed : Mach 2, or twice the speed of sound.
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| 5. | Those physical properties and the speed of sound change with ambient conditions.
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| 6. | It is the only seaplane to have exceeded the speed of sound.
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| 7. | Where were the indomitable winds that would surpass the speed of sound?
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| 8. | It can cruise faster than the speed of sound without using afterburners.
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| 9. | The speed of sound in mercury was also very dependent on temperature.
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| 10. | He uses two blades and can attack at the speed of sound.
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