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Latent heat in water vapor below boiling

  1. Sep 29, 2013 #1
    Hi -

    I'm a physics newbie so this is an elementary question, but I can't find the answer with a google search.

    Water evaporates at a wide range of temperatures, what is the latent heat in the water vapor (in calories or Joules), for example, at 30°C, 60°C? Assume standard atmospheric pressure. Does it change at different ambient temperatures?


  2. jcsd
  3. Sep 29, 2013 #2
    The heat of vaporization does change with temperature, approaching 0 at the critical temperature (which for water is about 374 C). The rate of change is relatively small when the temperature is well below the critical temperature, though.

    This page has a link to a PDF with the heat of vaporization at various temperatures between 0 C and the critical temperature.
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