I start getting a bit glassy eyed when the math formulas come out, but looks like
I see this part
Formulas for pressire effects (either due to ... or elevation of the plant above sea level can be derived from the same ideal gas equation (and considered in units of inch w.g.)
[1-((6.73)(10-6)(z))] where z is the ft elevation above sea level. which for 7000 ft equals 0.95289" and for 500' = 0.996635".
There is also another formula under it that results in 7000' @ 0.84544" and 500' @ 0.98896"
I don't know what the difference in formula is I think one has IP and one has SI near the reference number.
It would seem pretty negligible with only a 0.04" difference between you and a 500' person and in the second formula a 0.14" difference.
Edited by sandman, 23 March 2021 - 03:19 PM.