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Hypersonic flow is conventionally taken to begin at a Mach number of about

  • A.Ten
  • B.Five
  • C.One point two
  • D.Two

Answer: B

Mach five is the usual dividing line, chosen because above it effects such as strong shock layers, high-temperature gas chemistry and viscous interaction become important. The boundary is a convention rather than a sharp physical change.

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