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Mach1, Ernst (1838-1916), Austrian physicist and philosopher of science. He did important work on aerodynamics, while his writings inspired the logical positivist philosophers of the 1920s and influenced scientists such as Einstein and Niels Bohr. 马赫, 恩斯特（1838-1916, 奥地利物理学家和科学哲学家; 在空气动力学领域有重要贡献, 其著述启发了20世纪20年代的逻辑实证主义哲学家并影响了爱因斯坦和尼尔斯·波尔等科学家）。
(亦称Mach number) noun the ratio of the speed of a body to the speed of sound in the surrounding medium. It is often used with a numeral (as Mach 1, Mach 2, etc.) to indicate the speed of sound, twice the speed of sound, etc. （音速）马赫（数）。
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