Mach 9 or ''variation'', may refer to: *

Mach number Mach number (M or Ma) (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after the Moravian physicist and philosopher Ernst Mach. : \mathrm = \frac ...

for nine times the speed of sound **

Hypersonic speed In aerodynamics, a hypersonic speed is one that exceeds 5 times the speed of sound, often stated as starting at speeds of Mach 5 and above. The precise Mach number at which a craft can be said to be flying at hypersonic speed varies, since i ...

of 9 times the speed of sound * Wharfedale ''MACH 9'', a loudspeaker * ''Mach-IX'' (Marvel Comics), comic book superhero alter-ego of Marvel Comics character '' Abner Jenkins'' * "Mach 9 (nine) is equivalent to 6905.42 miles per hour - Source Google Unit Convertor

See also