Enter the absolute water pressure into the calculator below to determine the boiling point.
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Boiling Point Formula
The following equation (Antoine equation) is commonly used to relate water’s saturation (boiling) temperature to its vapor pressure (using absolute pressure).
log10(p) = A − B / (C + T)
T = B / (A − log10(p)) − C
- Where T is the boiling point/saturation temperature (°C)
- p is the absolute pressure (mmHg)
- A, B, and C are Antoine constants for water (commonly tabulated by temperature range)
To calculate the boiling point at a given pressure, convert the pressure to mmHg (absolute), compute T in °C using the rearranged equation above, then convert to °F or K if desired. (Below the triple point, liquid water is not stable and a normal boiling point is not defined.)
Boiling Point Definition
The boiling point of a liquid is the temperature at which its vapor pressure equals the surrounding (external) pressure.
How to calculate the boiling point of water?
How to calculate the boiling point of water?
- First, measure or specify the pressure.
Measure or specify the absolute pressure surrounding the water (not gauge pressure).
- Next, calculate the boiling point.
Calculate the boiling point using the equation above (and unit conversions as needed).
FAQ
The boiling point of water depends on the surrounding (external) pressure and can be calculated using the formula above.
