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'''Mach''' [number] is the number of times faster than the speed of sound that an object travels.
'''Mach''' [number] is the number of times faster than the [[speed of sound]] that an object travels.
For example, '''Mach''' 3 is the speed three times faster than the speed of sound, which was achieved by the [[SR-71 Blackbird]].
For example, '''Mach''' 3 is the speed three times faster than the speed of sound, which was achieved by the [[SR-71 Blackbird]].
Rockets commonly attain speeds faster than the speed of sound. Ordinary passenger airplanes do not. A "sonic boom" similar to thunder can be heard when an object "breaks the sound barrier" and travels faster than the speed of sound.
Rockets commonly attain speeds faster than the speed of sound. Ordinary passenger airplanes do not. A "sonic boom" similar to thunder can be heard when an object "breaks the sound barrier" and travels faster than the speed of sound.
[[category:military]]
[[Category:Military]]