Ernst Waldfried Josef Wenzel Mach, 1838-1916

Timeline created by Iliofol
  • Supersonic Speed and Shockwaves

    Supersonic Speed and Shockwaves
    Ernst Mach published his paper on the supersonic flow and shock waves created by bullets moving at supersonic speeds. His paper was titled "Photographische Fixierung der durch Projektile in der Luft eingeleiten Vorgange". Mach was the first person to create a method for visualizing liquids passing over objects at supersonic speeds.
  • Mach's Principle

    Mach’s principle, in cosmology, hypothesis that the inertial forces experienced by a body in nonuniform motion are determined by the quantity and distribution of matter in the universe ("Mach's Principle"). This principle was originally developed by George Berkeley, but was named after Mach by Albert Einstein.
  • Mach's Number

    This number is the ratio of the velocity of a fluid to the velocity of sound in the same fluid.

    The term was first publicized in 1929 when Swiss engineer Jakob Ackeret (1898-1981) named the variable in honor of Mach during a lecture at the Eidgenossiche Technishe Hochschule in Zurich (“Ask Us - Ernst Mach and Mach Number”).
    If the equation relates an answer less than 1, it is considered subsonic, while greater than 1 makes it considered supersonic.
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    Famous Works

    Mach, Ernst. Die Mechanik in ihrer Entwickelung (Mechanics and Its Evolution). Leipzig, 1883. Mach, Ernst, and Andrew Pyle. The Analysis of Sensations. Routledge, 1996. Mach, Ernst, and McCormack, Thomas J. Popular Scientific Lectures. Hansebooks, 2017.
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    Mach and Philosophy

    Ernst Mach held the Chair of Philosophy of Inductive Sciences at the University of Vienna and a prominent influencer of the Vienna Circle.
    Mach was chiefly known for enhancing the ideas of science being derived from sensations, thereby backing the Logical Positivist movement.
    Mach was a historian of science, and a philosopher of science. Mach more than anyone else bridged the divide; he is a founder of the philosophy of science (Pojman).