Consider the actual number of oxygen atoms inside the tire. The oxygen in
the tire amounts to only about 21% of the total air in the tire -- nitrogen
as it's already been pointed out is already about 78% in air. Air is far
less dense than rubber. Assuming the air isn't being changed regularly,
once the few oxygen atoms react out, there won't be any more oxygen
available to oxidize the inside ot the tire.
Of course, we ARE coming up on annual tire air rotation month, so maybe some
people's tires WILL get a fresh new load of oxygen ;-)
But it's going to take lots of air changes to approach the amount of oxygen
damage the outside of the tire gets in even a short time.
Same principle applies to hydronic heating systems. In the absence of any
water treatment, the oxygen and other impurities in the initial charge of
water react out quickly, and if there aren't any leaks and the system isn't
drained and refilled often, there's virtually no corrosion inside the
piping. Black iron was traditionally used in this application, although
today copper is more popular.
Karl
|