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Mach number is the ratio of

  • A.Flow speed to the local speed of sound
  • B.Inertial forces to viscous forces in the flow
  • C.Lift to drag for a given body at a given angle
  • D.Static pressure to total pressure in the stream

Answer: A

Mach number measures how fast the flow moves compared with the speed at which pressure disturbances travel, so it governs whether compressibility matters. The ratio of inertial to viscous forces is Reynolds number, a quite different group.

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