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Vapor pressure

  1. Nov 30, 2014 #1
    Vapor pressure possible only in closed system? b.p is when vapor pressure become equal to atmospheric pressure in which system closed or open ?
     
  2. jcsd
  3. Nov 30, 2014 #2

    Borek

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    Doesn't matter whether the system is closed or open.
     
  4. Nov 30, 2014 #3
    But in open system let's say a vessel without a lid ,how vapor pressure would be created in such conditions?
     
  5. Nov 30, 2014 #4

    Borek

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    Go outside, is there vacuum around, or a pressure of around 1 atm?
     
  6. Dec 1, 2014 #5
    But that is atmospheric pressure ,i am talking about vapor pressure.Is vapor pressure a type of or same as atmospheric pressure ?
     
  7. Dec 1, 2014 #6

    Borek

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    Pressure is a pressure is a pressure. Vapor pressure is just a partial pressure of a particular gas (typically water), but it doesn't differ from partial pressures or any other gases. If you stand over a puddle of a liquid nitrogen, you can call nitrogen pressure a "vapor pressure".
     
  8. Dec 1, 2014 #7
    In this situation, the partial pressure at the interface between the liquid and gas phases is equal to the vapor pressure. At distances further from the interface, the partial pressure is less than the vapor pressure. So there is a driving force for the vapor to transport away from the interface through the air.

    Chet
     
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