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TeachMeFinance.com - explain speed of sound speed of sound 'speed of sound' is an military term meaning '(DOD,NATO) The speed at which sound travels in a given medium under specified conditions. The speed of sound at sea level in the International Standard Atmosphere is 1108 ft/second, 658 knots, 1215 km/hour. See also hypersonic; transonic'. Previous 5 Terms: specified combatant command- specified command - specified task spectrozonal photography speed of advance_ Next 5 Terms: split cameras- split pair - split vertical photography split-mission oriented protective posture split-up_ Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.