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Dec 17, 2003
This week's theme
Words from aviation

This week's words
canard
contrail
mach
empennage
aileron

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A.Word.A.Day
with Anu Garg

mach

(makh) Pronunciation RealAudio

noun: A number indicating the ratio of the speed of an object to the speed of sound in the surrounding medium. So a plane moving at twice the speed of sound is traveling at Mach 2. Also known as mach number.

After Ernst Mach, physicist and philosopher (1838-1916).

"While the world knew one version of Chuck (Yeager) -- a World War II fighter pilot, first man to surpass Mach 1 speed at 700 mph, a Vietnam combat commander and central character in the 1983 movie 'The Right Stuff' -- Cody knew another."
Sam Amick; A Young Yeager Tests His Limits; Sacramento Bee; Nov 28, 2003.

"Zebras and giraffes cross our path at a gallop, anxious to get out of the way as the jeep hits about 20 mph, which feels like Mach speed in an open-air vehicle.
Tamara Lytle; Breathtaking Botswana; Orlando Sentinel; Nov 2, 2003.

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