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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In 1925, Holt Caterpillar merged with C.L. Best to form the Caterpillar Tractor Company. In 1986, the company name was changed to Caterpillar Inc. In 1999, the company built a factory in St. Petersburg, Russia. Today, Caterpillar is the worldâs leading manufacturer of construction and mining equipment.