(thing) by xdc Sat Nov 13 1999 at 14:30:15
  1. a compressional wave of high amplitude caused by a shock (as from an earthquake or explosion) to the medium through which the wave travels

  2. a violent often pulsating disturbance or reaction
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(thing) by kessenich Sat Nov 13 1999 at 14:30:15
A near-discontinuous coalescence of compression waves that irreversibly and anisentropically decelerates a flow from super- to subsonic. Occurs whenever a physical body is immersed in supersonic flow.

A shock is the closest thing in nature to a discontinuity.
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