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Liquified Nitrogen!

  1. Jun 10, 2010 #1
    I know the undeniable substantial applications of cryogenics fluids in engg. sciences, but can't hold on how these fluids are cooled or liquifed from gaseous state??
     
  2. jcsd
  3. Jun 10, 2010 #2

    chemisttree

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    At what pressure would nitrogen exist as a liquid at RT? How about at -80C?
     
  4. Jun 12, 2010 #3
    ^^

    definitely not at RT, what i think!!
    :)
    boiling point of N2 -196 C
     
  5. Jun 12, 2010 #4

    russ_watters

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    It's done by utilizing the ideal gas law: when you pressurize a gas it heats up. If you cool it back to room temperature while maintaining the pressure, then let it expand through a nozzle, it cools down. Do that enough and you'll liquify it.
     
  6. Jun 21, 2010 #5
    thanx

    wish could have link for detailed citation
     
  7. Jun 21, 2010 #6

    phyzguy

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  8. Jun 22, 2010 #7

    Q_Goest

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    Last edited by a moderator: Apr 25, 2017
  9. Jul 31, 2010 #8
    The Joule Thompson effect will get you a temperature change by expanding through a nozzle, but for added cooling, expand in an expansion engine. Gas that does work loses energy ;-)
     
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