Originally Posted by Mercedes Benz of Florida
Purified Nitrogen is used in 100% of All JetLiners in the World.
Nitrogen molecule is much larger than Air Molecule so it does not escape through the
Rubber tires AS readily. It is also Inert so it will not change size nor shape due to fluctuating ambient temperatures. Nitrogen is purified. Regular Gasoline Station Air smells dirty, has particulate matter and has a High moisture content. It's no wonder the Air inside the Car Tire smells like a Teenagers dirty Sneaker!
This one post contains most of the mythology and marketing hype surrounding nitrogen. Let's clear a few things up:
Airplane tires are filled with nitrogen because if you want to get 200psi pressures, it's easier to do by filling from the liquified nitrogen tank which is standard equipment in most airport repair hangars (used for welding and such).
A nitrogen molecule is SMALLER than an oxygen molecule. Don't trust me, check the periodic table. Periodic Table of Elements and Chemistry
A gas will change size and shape, not to mention pressure, regardless of whether it's chemically inert. In this regard, air and nitrogen are identical for all practical purposes.
The only thing correct here is that air contains more moisture than nitrogen. But this assumes that the equipment is in good shape. .
Look at it this way, air contains 78% nitrogen. So you're getting a mostly nitrogen fill for free. If all this cr_p was true, then the O2 would work it's way out of the tire, and you'd quickly be left with pure nitrogen.