MikeP wrote:
In article 12433-44380DE0-234@storefull-
3133.bay.webtv.net, says...
OK but what compression rating equals what lb. a factory new 9.5-1
equals how many pounds pressure with a compression tester. It has to be
a simple formula.
PV=nRT ?
Assume nRT remains constant (actually they don't
because compression increases T which increases
the pressure). So P1V1 = P2V2 or solved for V2=
(P1/P2)x V1 . Actually you just assume the
normal pressure is 15psi at sea level so just
multiply the 15 psi by the volume change ( in this
case 9.5). That would be absolute so on subtract
one for the actual pressure gage.