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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Rolaids is an American brand of calcium-based antacid produced by Chattem. It was invented by American chemist Irvine W. Grote in the late 1920s, and originated with manufacturing in Chattanooga, Tennessee under one of Chattem's forerunner companies, which manufactured the brand for Warner-Lambert; Warner-Lambert merged with Pfizer in 2000. In 2006, McNeil Consumer Healthcare, a subsidiary of Johnson & Johnson, acquired the brand from Pfizer Consumer Healthcare. In 2013, McNeil sold the brand to