Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Air pressure dependent water evaporation

  1. Aug 13, 2010 #1
    Imagine a water basin, surrounded by air. How does evaporation speed of water change if the air pressure of surrounding air is 1.000Pa, 10.000Pa, 100.000Pa, 1.000.000Pa, 10.000.000Pa. What is an order of magnite of the evaporation speed change. Where can I read more about that?
  2. jcsd
  3. Aug 13, 2010 #2


    User Avatar

    The surprising answer is that it doesn't change. The evaporation speed is dependent on the partial pressure of the water vapor above it, not the total pressure of the air.

    The exception to this is if the air pressure is lower than the water's vapor pressure. Then the water will boil, which significantly increases its evaporation speed (I don't know an exact number though).
  4. Aug 14, 2010 #3
    Does there exist any liquid which would change the evaporation speed as a function of air pressure?
  5. Aug 14, 2010 #4


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You are looking for the "Poynting correction."
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook