[footfootfoot]

I wasn't referring to the seal of the jar, I know how that works, I'm not a 'tard. I'm still confused because if both parts are shrinking or expanding then their relative dimensions would be the same unless the parts shrank/expanded at different rates.

In any case at that altitude the temp is usually about -40f, the plane must be going as fast as a motherfucker to create that much heat in a) the cold and b) the thinner air at that altitude.