Nitrogen is a real ripoff 2000 cu ft tank is about $2.00. The air we breath is 78% Nitrogen and 20,95 Oxygen the remaining quantity 2% close to 1% Argon the last 1% is a combination of 6 gases including CO2. Over time Oxygen and other gases will leach out of tire similar to why balloon deflates over time with no apparent leak quicker when filled with Helium the molecule is so small.
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