Liquified Nitrogen!

MalliCk

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??

chemisttree

At what pressure would nitrogen exist as a liquid at RT? How about at -80C?

MalliCk

^^

definitely not at RT, what i think!!
:)
boiling point of N2 -196 C

russ_watters

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.

MalliCk

thanx

wish could have link for detailed citation

phyzguy

Try this:

http://en.wikipedia.org/wiki/Joule%E...Thomson_effect

Q_Goest

Air is separated in various ways, but the most common method is to separate it cryogenically. Here's a couple of references.
http://www.uigi.com/cryodist.html
http://www.che.cemr.wvu.edu/publicat...e_proj/air.PDF

Mike_In_Plano

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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MalliCk	Liquified Nitrogen! Tweet 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??

chemisttree Recognitions: Gold Member Homework Help Science Advisor	At what pressure would nitrogen exist as a liquid at RT? How about at -80C?

russ_watters Mentor	Liquified Nitrogen! 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.

phyzguy	Try this: http://en.wikipedia.org/wiki/Joule%E...Thomson_effect

Q_Goest Blog Entries: 7 Recognitions: Gold Member Homework Help Science Advisor	Air is separated in various ways, but the most common method is to separate it cryogenically. Here's a couple of references. http://www.uigi.com/cryodist.html http://www.che.cemr.wvu.edu/publicat...e_proj/air.PDF

Mike_In_Plano	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 ;-)