Units of measurement
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Mach (Mach)
Knot (kn)
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Information
Mach (Mach)
Mach is a unit of speed based on the speed of sound in air. Mach 1 is equal to the speed of sound, which varies with air temperature (approximately 343 m/s at 20°C).
Knot (kn)
Knot (kn) is a unit of speed used in maritime and aviation navigation, equal to one nautical mile per hour (approximately 1.852 km/h).