Let's say I have a container filled with water and its surface is in direct contact with air. How much heat/energy do I have to supply to the water such that it evaporates under its boiling point? is there even such a formula? I've looked everywhere, and the resources that I have found just calculates the amount of water (in mm/day) is evaporated, and not the amount of energy needed to evaporate the water under its boiling point.

Sorry if my question seems confusing.


  • $\begingroup$ Check out pan evaporation, been done for many many years. One of the results used to prove Global Dimming. $\endgroup$
    – Solar Mike
    Apr 27 at 9:55

1 Answer 1


The value you look for is the Enthalpy of vaporization. This is temperature dependent and can be found in a steam table (or with one of the steam table calculators)


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