The total pressure on Everest would be 34 kPa (or one-third of 102 kPa), and the partial pressure of oxygen would be 34 0.208 = 7.07 kPa.
Atmospheric pressure is the amount of force a given atmospheric column exerts relative to its size. At Mount Everest's summit (8848 m above sea level), the atmospheric pressure is 253 mmHg. The risk to a climber's life at high altitudes may come from the altitude itself. Since atmospheric pressure decreases with altitude, it is 33% lower at the summit of Everest than it is at sea level. Air pressure increases as air density decreases and air thickness increases. The density of air is influenced by a variety of factors. Most significantly, air becomes less dense as altitude rises, lowering atmospheric pressure.
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