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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 | + | '''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 speed of an object or flow relative to the speed of sound in the medium through which it is travelling. |
| − | The Mach number is commonly used both with objects | + | The Mach number is commonly used both with objects travelling 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 | + | Since the speed of sound increases as the temperature increases, the actual speed of an object travelling at Mach 1 will depend on the fluid temperature around it. |
The Mach number is named after Austrian physicist and philosopher Ernst Mach. | The Mach number is named after Austrian physicist and philosopher Ernst Mach. | ||
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A longer and more technical version of the article on [[w:Mach (speed)|Wikipedia ]] | A longer and more technical version of the article on [[w:Mach (speed)|Wikipedia ]] | ||
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[[Category:Glossary]] | [[Category:Glossary]] | ||
[[Category:Aerodynamics]] | [[Category:Aerodynamics]] | ||