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Machalso mach (mäk)
(Units) short for Mach number
(Biography) Ernst (ɛrnst). 1838–1916, Austrian physicist and philosopher. He devised the system of speed measurement using the Mach number. He also founded logical positivism, asserting that the validity of a scientific law is proved only after empirical testing
a number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving. Abbr.: M
[after E. Mach]
Ernst, 1838–1916, Austrian physicist.
Mach- The scale measuring the speed of an object or fluid relative to the speed of sound is named for philosopher/physicist Ernst Mach (1838-1916), who researched thermodynamics; Mach is the ratio of the speed of something to the speed of sound in the surrounding medium.
See also related terms for measuring.