Water boils at 100 degrees Celsius under standard atmospheric pressure at sea level, but this boiling point varies with changes in pressure and altitude.
Mostly True
Water boils at 100 degrees Celsius
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At a glance
Verified July 30, 2025Key Evidence
Water boils at 100°C at 1 atm pressure (sea level), but this temperature decreases with lower atmospheric pressure and increases with higher pressure. The Celsius scale was historically defined using this boiling point under standard conditions.
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en.wikipedia.orgen.wikipedia.orgBoiling point
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The reporting
What the Evidence Shows
The statement "Water boils at 100 degrees Celsius" is generally accurate when referring to the boiling point of water at standard atmospheric pressure (1 atm) at sea level. This is a widely accepted fixed point used in temperature scales such as Celsius.
However, the boiling point of water is not a constant universal value; it depends on the surrounding atmospheric pressure. At higher altitudes where atmospheric pressure is lower, water boils at temperatures below 100°C, and under increased pressure, it can boil at temperatures above 100°C. Scientific sources and educational materials confirm that the boiling point of water is approximately 100°C only under normal atmospheric conditions.
Therefore, while the statement is true in a common context, it lacks the nuance that boiling temperature varies with environmental conditions.
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