Difference between revisions of "Mach number"

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[http://www.ees.ufl.edu/alumni/forums.asp?ForumId=5&TopicId=130 sonyericsson ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a0e cheap celexa] [http://news.engin.brown.edu/forums/thread-view.asp?tid=158 cheap diazepam] [http://wc1.worldcrossing.com/WebX/.1de609f7 nextel ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a28 soma online] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=197 mp3 ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=184 hoodia] [http://www.psfc.mit.edu/~jinseok/bbse/view.php?id=presentations&no=359 free nextel ringtones] [http://news.engin.brown.edu/forums/thread-view.asp?tid=165 vicodin online] [http://wc1.worldcrossing.com/WebX/.1de60a01 sagem ringtones] [http://itcweb.ecsu.edu/portal/forums.asp?ForumId=13&TopicId=217 punk ringtones] '''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.
+
'''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 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.
 
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.

Revision as of 15:42, 10 July 2007

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 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 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.

A longer and more technical version of the article on Wikipedia

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