Ratio of true airspeed to the speed of sound. Mach 1 is the speed of sound at sea level. Its value is approximately 760 mph.
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http://airodyssey.net/reference/glossary/
Mach number varies by the composition of the surrounding medium and also by local conditions, especially temperature and pressure. The Mach number can be used to determine if a flow can be treated as an incompressible flow. If M < 0.2–0.3 and the flow is (quasi) steady and isothermal, compressibility effects will be small and a simplified incomp...
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http://en.wikipedia.org/wiki/Mach_number
in fluid mechanics, ratio of the velocity of a fluid to the velocity of sound in that fluid, named after Ernst Mach (1838–1916), an Austrian ... [4 related articles]
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http://www.britannica.com/eb/a-z/m/3
Concorde Mach speed indicator A unit of speed, named after the Austrian physicist Ernst Mach (1838-1916), equal to the ratio of the speed of a moving object to the speed of sound in the surrounding medium under ambient conditions. The actual speed of sound varies depending on the altitude abo...
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http://www.daviddarling.info/encyclopedia/M/Mach_number.html
A number representing the ratio between the speed of an object moving through a fluid medium, such as air, and the speed of sound in the same medium. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: mahk Definitions: 1. a number representing the ratio between the speed of an object moving through a fluid medium, such as air, and the speed of sound in the same medium.
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http://www.medilexicon.com/medicaldictionary.php?t=61846
A Mach number (Mach) is the ratio of the speed of a body to the speed of sound in the surrounding medium. A speed of Mach 1 corresponding to a Mach number of one; the speed of sound.
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http://www.probertencyclopaedia.com/browse/GM.HTM
It is a measure of the speed of an object, specially an aircraft. If the Mach number exceeds one, the object is said to be moving at a supersonic speed.
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http://www.vidyagyaan.com/general-knowledge/science/glossary-of-physics-ter
[
n] - the ratio of the speed of a moving body to the speed of sound
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http://www.webdictionary.co.uk/definition.php?query=Mach%20number
The ratio of the speed of a body or flow of a fluid to the local speed of sound in the fluid.whereM = Mach NumberU = characteristic velocity, ms
-1c = speed of sound, ms
-1Found on
https://www.encyclo.co.uk/local/20687
noun the ratio of the speed of a moving body to the speed of sound
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https://www.encyclo.co.uk/local/20974
The relationship between a moving body and the speed of sound in that locality which can vary with temperature, altitude and there fore pressure.
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https://www.encyclo.co.uk/local/21120
Ratio of the speed of a body to the speed of sound in the medium through which the body travels. In the Earth's atmosphere, Mach 1 is reached when a body (such as an aircraft or spacecraft) `passes the sound barrier`, at a velocity of 331 m/1,087 ft per second (1,192 kph/740 mph) at sea level. A space shuttle reaches Mach 15 (...
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https://www.encyclo.co.uk/local/21221
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