Posted by willie in mn on January 05, 2013 at 17:52:17 from (67.142.168.22):
In Reply to: Re: Tire pressure posted by 55deere70 on January 05, 2013 at 17:16:12:
The nitrogen theory is a sales gimmick. Ambient air, what is out there in nature, is 80% +/- nitrogen, & 20% other gasses & water vapor. Thing about bottled nitrogen is that the process of compressing & filling the tanks squeezes out the water. Same thing happens with air. Ever notice the water collected in compressor tanks? Water vapor expands with heat more than the other gasses. A good drier, such as used inline for paint guns, will give the same result without the major expense. Size of molecules has very little, if any, effect on leakage. Wayne started out right, 10 deg temp change makes approx 1 psi pressure change. To stretch the point a bit, winter air does actually contain a bit less water vapor tham summer air. Willie
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