Reply #10: What pV=nRT implies is that any gas, if temperature increases

[Rabrrrrrr]

the volume will increase; or, if volume is constricted by the container, the internal pressure will increase.

The opposite for temperature that goes down.

Applies to all gases, even the noble gases and inert ones.

p - pressure
V - volume
n - number of moles of the gas
R - the gas constant
T - temperature

let's consider a hypothetical tire filled with nitrogen: For all intents and purposes, we can consider the tire to be uniform in volume over a wide range of temperatures (it's not, but the variance is so small, that we can consider it a constant for this instance). The amount of gas will remain constant in this instance. R is always the same (because it's a constant), so in our equation we have V, R, and n all remaining constant, leaving only p and T to vary.

So, therefore, as T increases, so does p. As T decreases, so does p.

Even with nitrogen.

So your initial statement that nitrogen never changes in volume is quite erroneous, and if true, would make it impossible to fill tires with it, or to make liquid nitrogen.