Quote:
Originally Posted by justatroll
For a sealed system (tire), n (number of moles) and R (ideal gas constant) will not vary AT ALL.
They are constants and by definition will not change during this experiment.
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To clarify: they will obviously not change for a sealed tire, but what I mean is that will be different for tire 1 filled with gas 1 (say nitrogen) vs. identical tire 2 filled to the same pressure (or volume) with gas 2 (e.g. humid air)
And it is the nR that determines how the pressure in a tire filled with a particular gas (with it's particular n and especially particular R) will respond to temperature changes.
In other words: My thought experiment is that I have two tires at the same temperature and pressure, one filled with gas 1 and the other one with gas 2. Then I heat up both tires to a higher temperature, still identical between the tires. The pressure will rise in both tires, but probably by a different amount. This pressure increase is determined by nR of the particular gas.
My point is that even though R of water vapor is higher than R of dry air or nitrogen, there is so little vapor in the air even at saturation (100% relative humidity) at high temperatures, that the effect on pressure
change in response to temperature change will be minimal.