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The altimeter is essentially

  • A.A rate of change of pressure sensor
  • B.A temperature compensated thermometer
  • C.An aneroid barometer calibrated in feet
  • D.A differential pressure gauge across the pitot

Answer: C

A sealed capsule expands as static pressure falls, and the movement is scaled through the standard atmosphere relationship to read height. It measures pressure and nothing else, which is why every altimeter error traces back to a pressure error.

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