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468 Posts
Cash grab.
300 cubic feet of nitrogen (at standard temperature and pressure) costs $8.
http://www.umass.edu/procurement/contracts/CA11-RH-4042%20-%20Pricing%20Recap%20for%20Air%20Gas.pdf
Basically there are 2 questions.
Can you measure the difference in loss between air and pure(er) nitrogen?
Yes.
Does it matter?
No.
300 cubic feet of nitrogen (at standard temperature and pressure) costs $8.
http://www.umass.edu/procurement/contracts/CA11-RH-4042%20-%20Pricing%20Recap%20for%20Air%20Gas.pdf
Basically there are 2 questions.
Can you measure the difference in loss between air and pure(er) nitrogen?
Yes.
Does it matter?
No.