ATPL Human Factors Practice Questions - CASA Airline Transport Pilot Licence (Aeroplane) - Human Factors (AHUF) Exam

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According to Dalton's law of partial pressures, as an aircraft climbs, what happens to the atmospheric pressure and the partial pressure of oxygen in the atmosphere?

The partial pressure of oxygen increases to compensate for the decrease in atmospheric density. Atmospheric pressure decreases, but the partial pressure of oxygen remains constant because the percentage of oxygen in the air does not change. Both atmospheric pressure and the partial pressure of oxygen increase due to the cooling effect of the atmosphere. Both atmospheric pressure and the partial pressure of oxygen decrease in direct proportion to altitude.

Correct Answer:

Both atmospheric pressure and the partial pressure of oxygen decrease in direct proportion to altitude.

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