Yeah, as a newbie, I've been measuring tire temperature and pressure, too. I
don't
have a clue about what I'm doing, but I do it because I see everyone else doing
it. The measurements do seem to be pretty consistent with the examples that I
gave, so I don't think expansion of the tire changes the volume much. Water
will
not effect the pressure/temperature relationship as long as it doesn't condense.
Of course, different gases have different heat transfer properties, but since
air
is 80% nitrogen, its properties are pretty close to those of nitrogen. Rubber
deteriorates due to chemical reactions with oxygen. Could that be the reason
for
using pure nitrogen?
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