رقم الماك او الماخ كما يسميه بعض اخواننا Mach number ولما قد دخلنا في في موضوع النوزل وددت الى ان اشير الى هذا الموضوع ولو اني اعتقد انه يحتاج الى موضوع خاص ولكن حتى تكتمل الصورة نشير اليه في موضوع النوزل وذلك لغرض الترابط * وتقبلو تحياتي
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Mach number

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An F/A-18 Hornet at transonic speed and displaying the Prandtl-Glauert singularity just before breaking the sound barrier.


Mach number (Ma) (pronounced: [mɑːk], [mɑx], [mæk], see IPA) is a dimensionless measure of relative speed. It is defined as the speed of an object relative to a fluid medium, divided by the speed of sound in that medium:
where
is the Mach number is the velocity of the object relative to the medium and is the velocity of sound in the medium Mach number is the number of times the speed of sound an object or a duct, or the fluid medium itself, move relative to each other. It is named after Austrian physicist and philosopher Ernst Mach.*********************************************