Mach 1

   When airplanes first started to fly, their speed was measured like that of a moving vehicle on the ground. As air speeds increased, that method became obsolete, and a new method had to be found.
   Ernst Mach (1838-1916), an Austrian physicist, philosopher, mathematician, and physiologist, has given his name to the measurement of aircraft speeds. Mach was born in Moravia and held successive university chairs, first at Graz, in mathematics; second, Prague, in physics; and then in Vienna, in the philosophy of inductive sciences.
   Mach studied the action of bodies moving at high speeds through gases, and computed their speed in terms of the ratio between their velocity and the speed of sound. This, in air at sea level, is about 764 miles per hour. His experiments were published but remained obscure until the speed of aircraft began to approach the speed of sound. On October 14, 1947, thirty-one years after Mach's death, Captain Charles Yeager broke the sound barrier or, as scientists prefer to call it, "Mach 1."
   Mach's investigation into supersonic sound speeds of projectiles led to the present system for measuring speeds faster than sound—the Mach number. A Mach number under 1 (0.50) indicates a subsonic speed, a number over 1 (1.5, 3.2, etc.) indicates a supersonic speed—one faster than the speed of sound. Mach in addition gave his name to the Mach angle, the angle a shock wave makes with the direction of flight. Mach rejected Newton's idea about absolute space and time, which affected the thinking of Albert Einstein, and which cleared the way to one of the greatest discoveries for mankind—Einstein's theory of relativity.

Dictionary of eponyms. . 2013.

Look at other dictionaries:

  • mach — mach …   Dictionnaire des rimes

  • MACH (E.) — Physicien préoccupé en même temps de la critique historique des concepts physiques et des phénomènes de psychophysiologie des sensations, Mach a fourni une œuvre scientifique importante à la jonction de plusieurs disciplines, mais souvent mal… …   Encyclopédie Universelle

  • Mach — [ mak ] n. pr. • v. 1950; nom d un physicien autrichien ♦ Aéronaut. Nombre de Mach : rapport entre la vitesse d un mobile et celle du son se propageant dans le même milieu. Ellipt Voler à Mach 2, à Mach 3, à 2, 3 fois la vitesse du son (⇒… …   Encyclopédie Universelle

  • Mach — ist der Familienname folgender Personen: Alexander Mach (1902–1980), slowakischer Journalist und Politiker, Hauptorganisator der Deportation slowakischer Juden Edmund Mach (Chemiker) (1846–1901), österreichischer Agrarchemiker und Önologe Edmund… …   Deutsch Wikipedia

  • Mach — may refer to:* Mach number, a measure of speed * Gillette Mach3, a manual razor with three blades * Mach bands, an optical illusion * Muscarinic acetylcholine receptor, abbreviated mACh In computers* ATI Mach, a 2D GPU chip by ATI * Mach II, an… …   Wikipedia

  • Mach-O — Icône de terminal, semblable à celle du terminal de MacOS X Extension …   Wikipédia en Français

  • mach — MACH, machi, s.m. (fiz.) Unitate de măsură pentru viteza mişcării fluidelor, utilizată în aerodinamică şi în tehnica rachetelor, egală cu 340 m/s. ♢ Numărul lui Mach = raport între viteza unui proiectil, avion etc. într un fluid şi cea a… …   Dicționar Român

  • Mach-O — Расширение без расширения, .o, .dylib Разработан Университет Карнеги Меллон/Apple Inc. Тип формата двоичный, исполняемый, объектный, динамическая библиотека, дамп памяти Содержит исполняемый код …   Википедия

  • MACH — ist ein Betriebssystem Kernel, der 1985–1994 im Rahmen eines Projekts an der Carnegie Mellon University entwickelt wurde, und gehört zur Klasse der Mikrokernel. Eine aktuelle Inkarnation der Mach Kernel Familie stellt der XNU Kernel dar. Die… …   Deutsch Wikipedia

  • Mach — [mæk US ma:k] n [U] [Date: 1900 2000; Origin: Ernst Mach (1838 1916), Austrian scientist] a unit for measuring speed, especially of an aircraft, in relation to the speed of sound. Mach 1 is the speed of sound, Mach 2 is twice the speed of sound… …   Dictionary of contemporary English

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.