CAA NZ CPL Human Factors Practice Questions - CAA NZ CPL Theory - Human Factors (New Zealand) Exam

According to Dalton's Law, what happens to the partial pressure of oxygen in atmospheric air as altitude increases?

It decreases in direct proportion to the drop in total barometric pressure, while its percentage composition remains approximately 21%. It remains constant because the percentage of oxygen increases at higher altitudes. It drops to zero above FL180 due to the complete absence of atmospheric oxygen. It increases exponentially as atmospheric density decreases.

Correct Answer:

It decreases in direct proportion to the drop in total barometric pressure, while its percentage composition remains approximately 21%.

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