Mach
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Mach
Ernst . 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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Mach
Refers to a Mach number, or the ratio of the speed of an airplane to the speed of sound in the same atmospheric conditions. It is also used as a speed unit. The speed of sound, or Mach 1, is equal to 340.5 m/s, 661 knots, 761 miles per hour, or 1225.5 km/h at sea level under standard conditions, and it decreases with altitude. Above the tropopause (about 36,090 ft, or 11 km), Mach 1 is 295.5 m/s, 574 knots, 658 miles per hour, or 1063.2 km/h. Named after Ernst Mach (1838–1916).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
Mach
An operating system kernel under development at
Carnegie-Mellon University to support distributed and parallel
computation. Mach is designed to support computing
environments consisting of networks of uniprocessors and
multiprocessors. Mach is the kernel of the OSF/1.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
Mach kernel
A Unix-like operating system developed at Carnegie-Mellon University in the period between 1985 and 1994. It was designed with a microkernel architecture that makes it easily portable to different platforms. Operating systems based on Mach include NextStep, OSF/1 and Mac OS X. See microkernel, Mac OS X and Open Group.Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.