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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]].