At the summit of Mount Everest, the highest point on Earth, water boils at approximately 70°C (158°F), a stark contrast to the 100°C (212°F) observed at sea level. At high altitudes like Mount Everest, the column of air above is significantly shorter, resulting in lower barometric pressure, sometimes dropping below 30 kPa.
How Everest's Thin Air Lowers Vapor Pressure and Lets Water Boil Faster
While precise measurements can fluctuate based on current weather patterns and the exact location on the summit, the figure of 70°C is a reliable benchmark for standard conditions. A traveler in these locations will notice that baking requires adjustments for leavening agents, and boiling potatoes takes longer.
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. This means that any attempt to cook pasta, brew coffee, or sterilize equipment with boiling water would require a significant adjustment in time and temperature management.
How Everest's Thin Air Lowers Water's Boiling Point via Vapor Pressure
Water molecules need enough kinetic energy to break free from the liquid and form bubbles, a process that requires the ambient pressure to be low enough to allow bubble expansion. This drastic drop is the primary reason for the low boiling point.
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