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The thickness of a shock wave in a gas at ordinary conditions is of the order of

  • A.A few millimetres
  • B.A few centimetres
  • C.The body length
  • D.A few mean free paths

Answer: D

A shock is thin enough that treating it as a mathematical discontinuity is an excellent approximation for any engineering purpose. Its structure is set by molecular transport, so it scales with the mean free path, typically well under a micron at sea level. Continuum theory cannot describe the interior, only the jump across it.

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