Nitrogen inflation is something which is done with high performance tyres.

Has anyone tried it on a kite?

From what I understand, it has benefits of lower pressure loss than air due to larger molecules, and I think that It's pressure may be more stable with temperature change??

Any thoughts??

May be good for competition, not that I am competing

very little mass difference (28g/mol vs 32g/mol) and at the pressures and temps we are talking about oxygen would behave mostly like nitrogen.

might also be worth remembering air is 79% nitrogen anyway ;)

i think the pressure loss on kites over time is from air escaping around valves, not through it passing through the bladder?

High performance tyres either on cars or aircraft are inflated with nitrogen for an added reason... if there is a fire the tyre will not explode and add oxygen to the fire further increasing the risk !

Ok... I have been thinking about this, and after being inspired by mythbusters last night, I have come up with a plan.

I have aquired 2 helium quality balloons.
I will fill on with Nitrogen and one with air, then put them in the fridge and see if there is a difference in size when they cool.

If you guys are right, there will be minimum change in size between the two ballons.

If there is a change then I might have a way of curing the air shrinkage when I drop my kite in Melbournes cold water. I hate that.

But before anyone else suggests this, Yes, I could learn not to drop my kite.