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kPa to in/Hg??
Posted: Wed Aug 02, 2006 4:48 pm
by kjones6039
What is the relationship between kPa and inches of mercury?
Posted: Wed Aug 02, 2006 5:04 pm
by PSIG
101.325kPa = 1 bar = 1 atomsphere = 29.92" Hg (mercury) = 14.6965 psi
Therefore 101.325kPa / 29.92"Hg = 3.3865kPa per inch of mercury. Other way around is 29.92 / 101.325 = .2952"Hg per kPa. Round 'em off for easy figuring.
Posted: Wed Aug 02, 2006 5:06 pm
by Bernard Fife
kjones6039,
101.3 kPa is roughly 0 inches of mercury (inHg) at sea level. 0 kPa is -29.92 inHg.
So at sea level on an 'average day':
inHg = kPa / 3.386 - 29.92
or
kPa = (inHg + 29.92) * 3.386
However, vacuum is measured relaive to the ambient pressure (which changes with elevation, the weather, etc.) but kPa is an absolute pressure scale, and doesn't change (which is why it's the preferred system of measurement).
See Eric's page and his very good converter here:
http://www.not2fast.wryday.com/turbo/bo ... rter.shtml
Lance.
Posted: Thu Aug 03, 2006 12:37 am
by kjones6039
Just the info I needed!!
Many thanks!!!!
Ken