Question

When the pressure is half of that at sea level, what is the altitude?.

A. 12,000 ft.
B. 18,000 ft.
C. 8,000 ft.

Answer 1

The altitude where the pressure is half of that at sea level is approximately 18,000 feet.

Step-by-step explanation:

The question pertains to how atmospheric pressure varies with altitude. At sea level, the standard atmospheric pressure is 760 mm Hg, which equates to 1 atmosphere (atm). As altitude increases, pressure decreases. On the basis of standard atmospheric conditions, the pressure is about half of sea level pressure at 18,000 feet (approximately 5500 meters). This observation is supported by the data showing that the pressure at an altitude of 14,000 ft corresponds to a pressure significantly lower than 1 atm, and the pressure at 29,028 ft (Mt. Everest) is approximately 0.308 atm.