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Pressure cooker at 1 atmosphere?

  1. Jan 7, 2015 #1
    Hi,

    I just read that the operating pressure of a standard pressure cooker is 15 psi or about 1 bar and they claim that water boils at 120C or 250F at this pressure.

    But atmospheric pressure is 1 bar in Paris and almost 1 bar in most countries in the world, here is a link I found http://www.engineeringtoolbox.com/boiling-point-water-d_926.html.

    So please someone explain how a pressure cooker can boil its water at 120C with 1 bar of pressure and the atmosphere boils its at 100C with 1 bar of pressure. ?:) whats going on here guys?
     
  2. jcsd
  3. Jan 7, 2015 #2

    Bystander

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    Google "gauge pressure."
     
  4. Jan 7, 2015 #3
    All right so if it says 15 psi its actually 15 psi above atmosphere??
     
  5. Jan 7, 2015 #4

    Bystander

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    Correct.
     
  6. Jan 7, 2015 #5
    Ok thanks man, very helpful :)
     
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