Sound barrier

In aerodynamics, the sound barrier is the apparent physical boundary stopping large objects from becoming supersonic. The term came into use during World War II when a number of aircraft started to encounter the effects of compressibility, a grab-bag of unrelated aerodynamic effects, and fell out of use in the 1950s when aircraft started to routinely "break" the sound barrier.

External links

• "Sound Barrier," a tutorial from the "Sonic Boom, Sound Barrier, and Condensation Clouds" (or "Sonic Boom, Sound Barrier, and Prandtl-Glauert Condensation Clouds") collection of tutorials by Mark S. Cramer, Ph.D. at http://FluidMech.net (Tutorials, Sound Barrier).
• "Breaking the Sound Barrier with an Aircraft" by Carl Rod Nave, Ph.D. at http://HyperPhysics.phy-astr.gsu.edu (Sound).
• "http://www.bakerlite.co.uk/fred_tesgo_mq.wmv" a video of a concorde reaching mach 1 at intersection TESGO taken from below.