pressure vs altitude and temp vs pressure
Posted: Thu Dec 20, 2012 8:54 am
Thanks to mcaapocci for the altitude tables
Show the change in tire pressure when going
from 0 ft. altitude,80 f, to 10000 ft.
altitude, 32 f.
Pa/Pb = Ta/Tb (directly proportional On the absolute scale)
14.7 + 32psig(starting gage pressure) =46.7psia (starting absolute pressure)
(14.7-10.1)=4.6 (atmospheric P at start and end point from the tables)(alg' added)
+ 32psig = 36.6psig
(end pressure. assume no temp change)
So: we had a temp change of -48 R therefore
Ta/Tb= 507/-459 : 36.6psig x 459/507(this ratio is =.905)
(delta temp)=33.13=the probable gage pressure at endpoint.
Not much !! was it worth it?
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