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Water boils at a lower temperature at high altitudes, because

June 1, 2025 by rawan239

Water boils at a lower temperature at high altitudes, because

the air pressure is less

outside temperature is less

latent heat is less

None of the above

This question was previously asked in

UPSC NDA-2 – 2017

Download PDF Attempt Online

Water boils at a lower temperature at high altitudes because the atmospheric pressure is lower. Boiling occurs when the vapor pressure of the liquid equals the surrounding atmospheric pressure. With lower external pressure, a lower temperature is needed for water’s vapor pressure to reach that level.

Boiling point is the temperature at which the vapor pressure of a liquid equals the ambient atmospheric pressure. Pressure decreases with increasing altitude, leading to a lower boiling point.

At sea level, the boiling point of water is 100°C (212°F) at standard atmospheric pressure. At significantly higher altitudes, such as in mountainous regions, the boiling point can be several degrees lower. For example, at an altitude of 5,000 feet (approx 1500m), water boils at about 95°C (203°F). This is why cooking times often need to be adjusted at high altitudes.

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