Why do the liquids boil at lower temperature at high altitude?

At high altitudes, the atmospheric pressure is quite low as compared to that at sea level. So water boils at a lower temperature at high altitudes.

Does altitude affect cooking?

When atmospheric pressure is lower, such as at a higher altitude, it takes less energy to bring water to the boiling point. Less energy means less heat, which means water will boil at a lower temperature at a higher altitude. Cooking at high altitudes differs from cooking at sea level. The boiling point of any liquid depends on the atmospheric pressure bearing down on its surface: the higher the pressure, the more energy it takes for liquid molecules to escape the surface and become a gas, and so the higher the temperature at which the liquid boils.

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