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A pitot-static tube determines airspeed by measuring

  • A.The absolute temperature of the oncoming air
  • B.The density of the air at the flight altitude
  • C.The angle between the body and the oncoming flow
  • D.The difference between total and static pressure

Answer: D

That difference is the dynamic pressure, from which speed follows once the density is known or assumed. Because the instrument is calibrated for a fixed density, indicated airspeed departs from true airspeed as altitude increases.

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