Approximation Formula
The vapour pressure of water may be approximated by the following relations (in order of increasing accuracy):
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- where P is the vapour pressure (mmHg) and T is the temperature in kelvin.
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- Using the Antoine equation
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- where the temperature T is in degrees Celsius and the vapour pressure P is in mmHg. The constants are given as
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| A | B | C | Tmin, °C | Tmax, °C | |
|---|---|---|---|---|---|
| Water | 8.07131 | 1730.63 | 233.426 | 1 | 100 |
| Water | 8.14019 | 1810.94 | 244.485 | 99 | 374 |
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