Final answer:
To calculate the O2 requirement at cabin pressure altitudes above 14,000ft, you can use the ideal gas law equation.
Step-by-step explanation:
The O2 requirement for cabin pressure altitudes above 14,000ft can be calculated using the ideal gas law equation.
We have the following information from Equation 8.4.5: 1 atm = 760 mmHg = 101.325 kPa.
Using this information, we can calculate the pressure at 14,000 ft. Then, we can use the equation PV = nRT to find the change in volume of air at the cruising altitude.