International Standard Atmosphere

British

noun

a theoretical vertical distribution of the physical properties of the atmosphere up to an altitude of 50 km established by international agreement. It permits the standardization of aircraft instruments and performance of all types of flying vehicles

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023