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Fire and liquid Oxygen.

  1. Mar 28, 2010 #1
    Earlier, I had posted that I thought that I had made liquid oxygen. People seemed skeptical that it would work, but I did an experiment to prove the concept.

    On a ring stand, I had some burning paper towel. I put some liquid nitrogen in a pie tin and allowed atmosphere to condense on the outside. Allowing this cold liquid to fall on the burning paper produced small spurts of burning paper. It was a bit difficult to keep the cold nitrogen vapors from blowing out the fire, but if the pie tin was held high enough, this was not an issue.

    I know this isn't any ground-breaking science, but it sure was fun!! Should I write a paper?
     
  2. jcsd
  3. Mar 28, 2010 #2

    Q_Goest

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    Hi flatmaster. What you saw was slightly concentrated oxygen. Oxygen condenses preferentially on the liquid nitrogen pan you had, producing an oxygen rich liquid because oxygen condenses at a slightly higher temperature.
     
  4. Mar 28, 2010 #3
    That's what I figured. It seems quite amazing that the cold nitrogen that's in there doesn't blow out the flame when it expands. I suppose the next step is to collect some and measure the relative concentrations. How can I do that?
     
  5. Mar 28, 2010 #4

    Q_Goest

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    Measuring oxygen concentration is much easier & less expensive than measuring nitrogen. See what's available to measure O2 concentration. Perhaps you could collect the drops off the pan by sucking them into an evacuated container.
     
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