I stand corrected sir. N2 is a molecule (known as an allotrope when a molecular chain is created using only one element). I do have a question for you however.
If N2 is two nitrogen atoms, and Nitrogen has an atomic number of 7 weight of 14.0067, and O2 is two oxygen atoms and has a atomic number of 8 and a mass of 16.000 how can the nitrogen molecule be bigger?? I am just asking here...not throwing pooh (of which I have no chemical knowledge)
I am thinking once again they use Nitrogen (PURE) to get rid of
a) The smaller elements in the 1% ..Hydrogen, hellium...blah blah
b) Get rid of the damaging effects of oxidation from the oxygen
What choo think??