Originally Posted by
D-OCHO
The main reason for the Nitrogen is that Nitrogen molecules are bigger then all the molecules that make up regular air. (Yes including O2 and H2O)
Fill a tire with Nitrogen and it will stay pressurized longer then when you fill it with regular air.
This is especially handy in the low pressure situations that aircraft are in when flying. You will still have pressure in you tires before landing.
This is definitely a myth. The O2 molecule (molecular weight 32) is actually
larger than the N2 molecule (molecular weigh 28). This one is right up there with the myth that if you fill your tires with nitrogen, the pressure won't increase when they get hot (I've heard that one a lot in the racing world, apparently they think that nitrogen doesn't conform to the ideal gas law)
