e air pressure on Pikes Peak in Colorado is approximately 600 millibars. What is the relationship between air pressure at the top of Pikes Peak and at sea level, where air pressure is 1013 millibars?

The pressure at the top of Pikes Peak is much lower (only about 60% that at sea level).

Explanation:

Atmospheric pressure decreases with altitude. The higher a location is in the mountains, the lower the atmospheric pressure will be. Pressure continues to decrease until the boundary with outer space where there is no air pressure at all and the atmosphere officially ends. Mountain climbers that scale the highest peaks in the world must bring oxygen tanks because of the scarcity of air at the roof of the world.