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A shock wave is best described thermodynamically as

  • A.An adiabatic but irreversible process
  • B.An adiabatic and reversible process
  • C.An isothermal process
  • D.An isentropic process

Answer: A

No heat crosses the shock, so it is adiabatic, but the steep gradients inside it dissipate energy and raise entropy, so it is irreversible. That combination is why stagnation temperature survives a shock while stagnation pressure does not, a distinction worth keeping firmly in mind.

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