3 kilopascals (kPa), or 1 atmosphere (atm). Boiling occurs when vapor pressure, the pressure exerted by a vapor in equilibrium with its liquid or solid phase, matches the atmospheric pressure pressing down on the liquid.
Sea Level Everest Boiling Point and Atmospheric Pressure
At 1,600 meters (5,280 feet), the boiling point of water drops to roughly 95°C (203°F). By the summit, at 8,848 meters, the pressure plummets to about 26 kPa, which is roughly 25% of the pressure found at sea level.
A traveler in these locations will notice that baking requires adjustments for leavening agents, and boiling potatoes takes longer. Cooking food thoroughly becomes a difficult task because water cannot exceed 70°C while in liquid form; it simply simmers rather than boils vigorously.
Sea Level Everest Boiling Point and Atmospheric Pressure
This significant reduction is not a anomaly but a direct consequence of the atmospheric conditions found at extreme altitude. Comparative Examples: Cooking at High Altitude The phenomenon observed on Everest is a scaled-up version of what many people experience in high-altitude cities like Denver or La Paz.
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