Chapter 13, Problem 62PE

Atmospheric pressure amp Mt. Everest is $3.30\times {10}^4{\text{N/m}}^{\text{2}}$. (a) What is the partial pressure of oxygen there if it is 20.9% at me air? (b) What percent oxygen should a mountain climber breathe so that its partial pressure is the same as at sea level, where atmospheric pressure is $1.01\times {10}^5{\text{N/m}}^{\text{2}}$ ? (c) One of the most severe problems for those climbing very high mountains is the extreme drying of breathing passages. Why does this drying occur?