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[Science teacher mode]
The IGL says P = nRT/V. The only things it cares about are amount of gas, temperature, and volume. Everything else is irrelevant for the IGL . . . which is why it's an approximation. In fact, it's in the name: the ideal gas law gives the pressure an ideal gas would have for those conditions.
The outside pressure and friction, among other things, have no effect on the IGL. They may factor into calculating the real pressure, but not into the pressure an ideal gas would have in that scenario.
[/Science teacher mode]
Sorry, I misspoke. I meant equation of determining a controlled test. Things like Barometric pressure and Dew Point influence the gauge's measurement but are outside of the formula we've been talking about for8 months .
Below is what I am referring to.
http://www.ajdesigner.com/idealgas/