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Any [[speed]] that is faster than the speed of [[sound]] in the substance of interest.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
Any [[speed]] that is faster than the speed of [[sound]] in the substance of interest.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
The prefix Mach is used to describe supersonic speed. It derives form Ernst Mach, a Czech born, German scientist who contributed to the study of sound. When a plan moves at the speed of sound (in air) it is Mach 1. When twice the speed of sound it is Mach 2. When a plane passes the sound barrier-flying faster than sound travels-listeners hear a [[sonic boom]].
The speed of sound in air is 770 mph, or 1130 ft/s (1230 km/h or 344m/s) in dry air at 70F <ref>Speed of Sound http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html, Retrieved 7March2008</ref>. Sound travels faster in water than it does in air, and even faster in iron and steel.
==References==
==References==