Quote:
Originally Posted by aerohead
Isn't the linear relationship valid if only barometric pressure is the single variable?
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Yes. Here's the relationship with two variables:
PV=nRT
nR/V=P/T
where nR/V can be equated with density, and T is absolute temperature, in Rankine or Kelvins.
If you want to add a third variable like humidity, or if the ideal gas approximation isn't good enough, it's time for a lookup table. I don't know what method the Javascript calculator I linked to uses.