Air pressure decreases as altitude increases. this is because air pressure is caused by the gravity of earth, the gravity pulls on the air, compacting it and making a pressure.
But as we go higher, gravity decreases, causing less pull on the air resulting in less air pressure.<span />
i would say, are sour and corrode metals
No the acceleration of gravity on earth is still 9.8ms-2 unless he was on a different planet
