Why is the saturated vapor pressure of water not correct when I use Antoine’s equation?
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Why do my calculations of the saturated vapor pressure of water using Antoine’s equation give incorrect results? According to the constants for water in reference manuals: A–7.07406, B–1657.46, C–227.02; log P = A – B / (t + C). Using this equation to calculate the saturated vapor pressure at 10°C yields P=1.0845, whereas the value obtained from empirical data is 1.22. Why is there such a large difference?
Take a look at the units for Antonin Changshu and pressure
This post was last edited by El Niño on 2019-6-11 at 17:01. First of all, you didn’t specify the units, so it’s not possible to determine whether there are any issues with your calculations or where those issues lie. Second, the Antoine equation itself has errors. Third, the parameters in the Antoine equation are usually valid only for a certain temperature range; beyond that range, a different set of parameters must be used.