he next two questions go together. . Air pressure decreases with incrcasing alti
ID: 3481618 • Letter: H
Question
he next two questions go together. . Air pressure decreases with incrcasing altitude. Although the decrease is ncarly lincar up to about 1000 m, the atmospheric pressure up to 7000 m can be better described as decreasing with height h by a factor of approximately (1-1, 16-10-4h + 44-10-9h) Some South Americans live at a height of about 5500 m (18,000 fn, 3. pressure is about 380 mm Hg. In air moistened at 37°C, the partial pressure of water vapor is 47 mmHg, so that the combined pressurc of other gases is 333 mmHg. Of these gases, oxygen still constitutes about 21%. What is the partial pressure ofoxygen in most inspired air at 5500 m? How much lower is the Poz at 5500 m than at sea level? 4 miles) above sea level, where the barometricExplanation / Answer
ince inspired air is 21% oxygen and atmospheric pressure is 380mmhg (sea level) at 5500m
partial pressure of oxygen is 0.21 x 380Hg = 79.8mmHg
Partial pressure of oxygen at 380mmhg, normal Partial pressure of oxygen is 760mmhg
760-380 = 380mmhg
50% is lower at 5500mmhg
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