If at top of a hill the atmospheric pressure is 60 cm of Hg and at the sea level the atmospheric pressure is 75 cm of Hg, and you need as much oxygen to breathe at sea level as on the top of the hill,

Question

If at top of a hill the atmospheric pressure is 60 cm of Hg and at the sea level the atmospheric pressure is 75 cm of Hg, and you need as much oxygen to breathe at sea level as on the top of the hill, how much faster need you breathe on the hill top?

TestHub · Accepted Answer

For the same O₂ intake, breathing rate is inversely proportional to the partial pressure of O₂ (O₂ fraction unchanged). Rate factor = 75/60 = 1.25. Matches (d).

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