you already know what altitude is right?? if you still don't know, the altitude is the height of an object from ground level. have you been fly with an airplane? does ear hurts? well that is because the air pressure is getting low. the higher you go the lower will the air pressure be. this is happening because the higher you go, the thinner air will be.
as you see from the graph, the higher you go, the air pressure will go lower. that's it! know you have know why your ears getting hurt and you know the relationship between air pressure and altitude.
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