Message text written by "Kurtis"
>Well, I'm no chemist... but normal air is already roughly 80% nitrogen, so
I'd think any benefits related to the chemical characteristics would be
minimal (expansion / leaking due to molecule size). There is likely some
validity to the claim regarding the moisture characteristics, since normal
air would typically contain moisture and pure nitrogen would not<
Indeed! And you can achieve the same thing using dry air. which is what
you get anyway. Since compressed air can hold less moisture the more it is
compressed the air in a tank will loose some of the air (which is why air
compressor tanks have drains). So if the air is compressed to 120 PSI and
allowed to cool to ambient and then put into a tire at 30 PSI the dew point
will be way low. You can lower it even more by doing this in the winter.
As far as the not expanding stuff goes, nitrogen still obeys the gas law.
PV=nRT. And since air is 80% nittrogen, it will leak out at the same rate
(Actually, oxygen, which comprizes most of the remaining 20% is an even
larger molecule (if just barely) so it will leak outt even more slowly
(though imperceptibly so).
In a word,: Snake Oil.
Dave
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