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Q & A: How to make Liquid Nitrogen

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Most recent answer: 09/29/2009
Q:
How do you make liquid nitrogen?
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- 5B students
Washington School, Monticello, IL USA
A:

A machine compresses air from 15 to 3,000 pounds per square inch (psi).This is the same pressure used in SCUBA tanks. When you compress air, it heats up. We run that hot air through some coils of tubing. By blowing room temperature air over the coils, we cool the compressed air.

Then we let that compressed air expand. It gets cold when it expands. We let that cold air blow over the coils of tubing to cool some more compressed air even colder. Eventually, the compressed air is so cold that when it can expand it doesn’t. It has become a liquid!

EJ

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(published on 10/22/2007)

Follow-Up #1: Uses for liquid nitrogen

Q:
how important in the economy a liquid nitrogen is?
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- jk (age 28)
gingoog city,mis.or.philippines
A:
I'm not sure of the actual number of dollars or pesos in the total economy of liquid nitrogen but the uses of it are innumerable, ranging from biological, to medical, to scientific laboratory work to etc. etc.  Without it, we would have to invent something to replace it.   Please take a look at this website for much information:  

LeeH
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(published on 09/29/2009)

Follow-up on this answer.