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mach
Mach may refer to:
Trivia about mach
(Sarah reports from the rear seat of a jet.) We won't go there today, but the Thunderbirds can reach ceilings of about 50,000 feet & fly 1500 miles per hour, roughly 2 on this scale
Any object said to be traveling at hypersonic velocity has a speed over 5 on this scale named for an Austrian
For a plane traveling 725 mph at 40,000 feet, this number is 1.1