At 8000 ft, the barometric pressure falls to 330 mmHg, what happens to partial pressure of oxygen?
(1) It remains 159 mmHg
(2) It increases to 1330 mmHg
(3) It changes to 70 mmHg
(4) No effect

Hi Meemansha,

Please find below the solution to the asked query:

The correct option is (3).
At 8000 ft, the partial pressure of oxygen falls to 70 mmHg approximately.
The partial pressure of oxygen is given by
Barometer pressure x 0.21
= 330 x 0.21 = 69.33.

Hope this information will clear your doubts about partial pressure of oxygen at 8000 ft.
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