N2?  Different in Oz?  Maybe you used Nitrous Oxide and got a little too
close.  Inert just means it won't react with the usual stuff.  Still follows
the gas law PV=nRT and expands with temperature.  But as has been mentioned
before my data is old and my kodachrome fades.  Hey, but the nails in your
tires won't rust from the inside.  Air has a large proportion of N2 in it as
shipped.  Now if it was He (helium) you might lighten your load.

p