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The purpose of the International Standard Atmosphere is to

  • A.Give the exact conditions at every point on earth
  • B.Replace the need for any atmospheric measurement
  • C.Provide an agreed reference for comparing performance
  • D.Describe the weather expected on any given day

Answer: C

It is a reference model, not a forecast: fixing sea-level conditions and a lapse rate lets aircraft performance and instrument calibration be quoted on a common basis. Real conditions differ from it constantly, which is why corrections are applied.

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