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The bag and pump have a 6.76-kg mass. The volume of the inflated bag is 0.476 m3. The maximal bag pressure is 0.15 x 105 N/m2 above the air pressure at the site where it is used. In the 1997 climb, with the temperature at -20°C, the bag was filled in about 2 min with 10-20 pumps per minute. This raised the pressure in the bag to 0.58 x 105 N/m2 (equivalent to an elevation of 4400 m) instead of the actual outside pressure of 0.43 x 105 N/m2 at the 6450-m elevation at which the climber was treated. The treatment lasted for 2 h, with the climber inhaling about 15 times/min at about 0.5 L/inhalation, and was successful-the pulmonary edema disappeared.
What is closest to the temperature at the 6450-m elevation on the day described in the problem?
a. 37 K
b. 253 K
c. 20 K
d. -20 K
e. 273 K
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