> The only difference I can see that has not been mentioned so far is that the
> Nitrogen is DRY.
Bingo.
> Water vapor certainly does not follow the gas laws at these
> conditions and the water vapor may condense at ordinary temperatures and
> vaporise at higher ones, thus changing the pressure slightly.
Yes.
> It seems to me
> that dry air would be just as good as dry Nitrogen.
Yes. Nitrogen is marketed in dry form, making it convenient to buy.
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