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From an Orsat analysis alone, the excess air is found by

  • A.measuring the water vapour present in the sample
  • B.weighing the fuel that is consumed in the period
  • C.reading the flame temperature of the burner
  • D.comparing the free oxygen with the nitrogen

Answer: D

Nitrogen fixes the total air that entered, and the free oxygen remaining is what was not needed, so the ratio of the two gives the excess directly. This is why a single dry gas analysis is enough to check how a furnace is being run.

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