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The continuum assumption in aerodynamics treats air as

  • A.A perfect vacuum containing no matter at all
  • B.A continuous medium rather than as individual molecules
  • C.A collection of discrete molecules moving independently
  • D.An incompressible liquid under all flight conditions

Answer: B

Because the mean free path is tiny compared with any aircraft dimension at ordinary altitudes, properties such as density and pressure can be defined at a point and the flow described by differential equations. The assumption fails only in very rarefied flow at extreme altitude.

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