The drag divergence Mach number is the Mach number at which the aerodynamic drag on an airfoil or airframe begins to increase rapidly as the Mach number
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en.wikipedia.org/wiki/Drag_divergence_Mach_number
en.wikipedia.org/wiki/Drag_divergence_Mach_number
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As the speed of the object approaches the speed of sound, the flight Mach number is nearly equal to one, M = 1, and the flow is said to be transonic. At some places on the object, the local speed exceeds the speed of sound.
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www.grc.nasa.gov/WWW/K-12/airplane/mach.html
www.grc.nasa.gov/WWW/K-12/airplane/mach.html
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The Mach Number is a dimensionless value useful for analyzing fluid flow dynamics problems where compressibility is a significant factor.
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www.engineeringtoolbox.com/mach-number-d_581.html
www.engineeringtoolbox.com/mach-number-d_581.html
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Speed of Sound in Air This calculation is usually accurate enough, but for great precision one must examine the more general relationship for sound speed in gases. This sound speed does not apply to gases other than air, It is important to note that the sound speed in air is determined by the air itself. It is not...
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hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html
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MACH NUMBER is defined as a speed ratio, referenced to the speed of sound, i.e. Since the temperature and density of air decreases with altitude, so does the speed of sound, hence a given true velocity results in a higher MACH number at higher altitudes.
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www.tscm.com/mach-as.pdf
www.tscm.com/mach-as.pdf
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Mach number also mach number n. ( Abbr. M ) The ratio of the speed of an object to the speed of sound in the surrounding medium.
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www.answers.com/topic/mach-number
www.answers.com/topic/mach-number
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The ratio of the speed of a fluid to the speed of sound in that fluid. If the Mach number is greater than 1, the fluid is moving at a supersonic speed; if the Mach number is greater than 5, the fluid is moving at hypersonic speed.
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sci2.esa.int/glossary/glossary_m.html
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How fast is Mach 1? What is the sound barrier? How fast do you have to go to break the sound barrier? How fast is the speed of sound at ground level? What does the term Mach number mean? What is the speed of an aircraft traveling at Mach 3 at an altitude of 30,000 feet?
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www.aerospaceweb.org/question/atmosphere/q0126.shtml
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Hutchinson encyclopedia article about Mach number. Mach number. Information about Mach number in the Hutchinson encyclopedia. The Mach number is named after Austrian physicist Ernst Mach...
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encyclopedia.farlex.com/Mach+number
encyclopedia.farlex.com/Mach+number
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