The Mach number is a ratio between the aircraft's speed (v) and the speed of sound (a). That is, M = v/a. The Mach number is named for the Austrian physicist, Ernst Mach (1838-1916). Technically, as you can see, the Mach Number is not a speed but a speed ratio.
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Carrera Porsche Design Foldable Sunglasses. It all began in 1948, when Wilhelm Anger founded the Wilhelm Anger Werker company that specialized in the manufacturing of plastic glasses. At the time, plastic sunglasses were in their infancy and Anger was a pioneer in that sector.