#shock_wave__shockwave  a region of high pressure travelling through a gas at a high velocity
  supertype:  #sound_wave__soundwave__acoustic_wave  (acoustics) a wave that transmits sound
  subtype:  #sonic_boom__sonicboom  an explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound; "a sonic boom follows an aircraft as a wake follows a ship"

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