Enter your Substance, Reference Pressure, Reference Boiling Point, and Target Pressure into the Boiling Point Calculator to find the Boiling Point at any pressure you choose — plus the results in °F and K, and a quick look at your Pressure Change and Temperature Change.
Boiling Point
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Boiling Point (°F)
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Boiling Point (K)
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Pressure Change
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Temperature Change
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Water boils at 100°C (212°F) at standard atmospheric pressure (1 atm or 760 mmHg). However, this temperature changes with altitude and atmospheric pressure variations.
The boiling point changes with pressure according to the Clausius-Clapeyron equation. Lower pressures result in lower boiling points, while higher pressures increase the boiling point. This calculator uses this relationship to estimate boiling points.
The Clausius-Clapeyron equation describes the relationship between vapor pressure and temperature for phase transitions. It's used to predict how boiling point changes with pressure for different substances.
At higher altitudes, atmospheric pressure is lower. Since liquids boil when their vapor pressure equals atmospheric pressure, they boil at lower temperatures when pressure is reduced.
Yes, boiling point is a physical property that's characteristic of each substance. It's the temperature at which a liquid changes to vapor when its vapor pressure equals the surrounding pressure.
Yes, adding salt to water raises its boiling point slightly (boiling point elevation). This is because dissolved particles interfere with the formation of vapor bubbles, requiring higher temperature to boil.
This calculator provides estimates based on the Clausius-Clapeyron equation, which assumes constant heat of vaporization. For most practical purposes, it's quite accurate, but actual values may vary slightly due to other factors.
You can calculate boiling points for common substances like water, ethanol, acetone, butane, and ammonia, or enter custom reference values for any substance you know the boiling point at one pressure.