# At an altitude of 11,000 m (a typical cruising altitude for a jet airliner), the air temperature is -60.0 ∘C and the air density is 0.491 kg/m3. The molar mass of air is 28.8 g/mol. What is the pressure of the atmosphere at that altitude? (Note: The temperature at this altitude is not the same as at the surface of the earth, so the equation P=P0exp(−MgyRT) doesn't apply.)

Question

At an altitude of 11,000 m (a typical cruising altitude for a jet airliner), the air temperature is -60.0 ∘C and the air density is 0.491 kg/m3. The molar mass of air is 28.8 g/mol.

What is the pressure of the atmosphere at that altitude? (Note: The temperature at this altitude is not the same as at the surface of the earth, so the equation P=P0exp(−MgyRT) doesn't apply.)

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