Final answer:
The air pressure at the top of Mount McKinley is roughly 23% of the air pressure at sea level. This estimate results from the known fact that every 8800 meters in altitude reduces air pressure to about one third of its previous value.
Step-by-step explanation:
The question is asking about the change in air pressure as you ascend Mount McKinley, which is a physical phenomenon that can be predicted using the known relationship between altitude and air density. As a general rule, for every 8800 meters you ascend above sea level, the air pressure drops by a factor of 1/e, or about one third of the previous pressure. This is caused by the decreasing air density with higher altitude, as clearly shown in the Altitude-Air Density Relationship graph.
Mount McKinley, or Denali, has a height of 6198 meters, which is approximately 70% of the 8800 meters. Using this, a rough estimate of the air pressure at the top of Mount McKinley would be about 70% of one third (0.7 * 1/3 = 0.23) of the sea level air pressure. This means the air pressure at the top of Mount McKinley is around 23% of the air pressure at sea level.
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