Because the atmosphere becomes thinner and less dense the higher you climb, the air pressure drops substantially, requiring less thermal energy for water to transition into a gaseous state. 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.
How Altitude Reduces Boiling Point on Everest
This extended cooking time can waste precious fuel and result in undercooked meals, which is not ideal for maintaining the caloric intake required for survival in such a hostile environment. At high altitudes like Mount Everest, the column of air above is significantly shorter, resulting in lower barometric pressure, sometimes dropping below 30 kPa.
Cooking food thoroughly becomes a difficult task because water cannot exceed 70°C while in liquid form; it simply simmers rather than boils vigorously. The boiling point of a liquid is defined as the temperature at which its vapor pressure equals the surrounding environmental pressure.
How Altitude Reduces Boiling Point
This significant reduction is not a anomaly but a direct consequence of the atmospheric conditions found at extreme altitude. A traveler in these locations will notice that baking requires adjustments for leavening agents, and boiling potatoes takes longer.
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