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Homework Help: Question about Partial Pressure

  1. Sep 13, 2009 #1
    Hi guys, i'm just wondering why is there partial pressure when they said all molecule occupy the same volume in a gas. like in rtp you get 22.4 .
  2. jcsd
  3. Sep 13, 2009 #2


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    Hi crays! :smile:

    Pressure (which is force per area) is basically the force caused by molecules hitting a (usually imaginary) square metre surface …

    so if only 20% of the molecules are oxygen, then the oxygen is supplying only 20% of that force. :wink:

    Also, as http://en.wikipedia.org/wiki/Partial_pressure#Dalton.27s_law_of_partial_pressures" says …
    Last edited by a moderator: Apr 24, 2017
  4. Sep 14, 2009 #3
    Thanks alot :)
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