As altitude increases, atmospheric pressure decreases, which means less oxygen is diffused into the blood from the lungs. for instance, at 18,000 feet you would obtain 29% less oxygen than you would at sea level. this can lead to altitude sickness, or hypoxia as it is called. imagine a mountain climber, who lives at sea level, trying to climb mount kilimanjaro for the first time. the climber is very fit so he plans to summit the 19,341 foot peak in four days, though it usually takes first-time climbers five or six days. use your knowledge of equilibrium to predict the climberâs reaction to this speedy climb, and the reaction needed to restore equilibrium.