Quote:
Originally posted by Serum
... but i thought they use it, because it hasn't got the large expanding air has got when it gets hotter..
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Serum, if they really use Nitrogen, it would have a very similar thermal expansion as air. (the thermal expansion of compressed gases is not much. It's more significant at atmospheric pressure. With gases, thermal expansion means more pressure. There's an awefull lot of equations on this, the infamous Thermodynamics of Gases. Very interesting, but a PITA to get in your head)