Editing Mach number

http://en.wikipedia.org/wiki/Mach_%28speed%29

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-'''Mach number''' (Ma) (pronounced in British English with a Germanic ''ch'', as "mack" or "mark" and as "mock" in American English) is defined as a ratio of the [[Velocity|speed]] of an object or flow relative to the [[speed of sound]] in the medium through which it is traveling.
+http://en.wikipedia.org/wiki/Mach_%28speed%29
-The Mach number is commonly used both with objects traveling at high speed in a fluid, and with high-speed fluid flows inside channels such as nozzles, diffusers or wind tunnels. As it is defined as a ratio of two speeds, it is a dimensionless number. At standard sea level conditions, Mach 1 is 1,225 km/h (761.2 mph) in the atmosphere.
-Since the speed of sound increases as the [[temperature]] increases, the actual speed of an object traveling at Mach 1 will depend on the fluid temperature around it.
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-The Mach number is named after Austrian physicist and philosopher Ernst Mach.
-A longer and more technical version of the article on [[w:Mach (speed)|Wikipedia ]]
-[[Category: Articles]]
-[[Category:Glossary]]
-[[Category:Aerodynamics]]