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The Rankine-Hugoniot relations express, across a shock,

  • A.The isentropic relations in a rearranged form
  • B.Conservation of mass, momentum and energy
  • C.Conservation of entropy and enthalpy only
  • D.Conservation of stagnation pressure

Answer: B

The three conservation laws applied across the discontinuity, together with the equation of state, give the complete jump conditions. They are not isentropic relations and must not be confused with them: entropy is an output of the Rankine-Hugoniot analysis, not an assumed constant.

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