Answer:
see explanation
Step-by-step explanation:
Increase altitude => decreasing pressure... as matter of fact, the standard lapse rate is - 1.0 lbs/in² per 1000 feet. That is ...
at earth's surface => P = 14.2 psi
at 1000ft => P = 13.2 psi
at 2000ft => P = 12.2 psi
at 5000 ft => P = 9.2 psi and so on.