Originally Posted by
fuzz2050
problem with the ideal gas law, it only really applies to IDEAL gasses,
Compare to the good thing about the ideal gas law -- it applies extremely well to gasses like oxygen, nitrogen and water vapor (and their mixtures) at the pressures and temperatures typically seen in tires.
The only place where it breaks down in any significant way for our purposes is when a gas turns into a liquid, or a liquid turns into a gas ...