Quote:
Originally Posted by CapriRacer
Fred Jackson san is correct, but here is another way of explaining it:
If you are using a gauge to measure pressure, it is always psig.
However, if you are using one of the gas laws, like the Ideal Gas Law: PV = nRT, both the temperature and pressure are absolute. Put another way, one would have to add 14.7 psi to any gauge measurement and 460° to any Fahrenheit temperature measurement. (273° for Celsius)
Oh, and I only look at this website using the search function: "tire". Your initial post didn't have that. It only showed up today because Fred used the word yesterday.
Also, it is pretty common for folks to use psia (for absolute) and psig when there might be confusion.
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Barryyyyyy!
Nice of you to join the party - away for the long weekend? Hope you and all concerned are fine.
Thanks for the additional explanation, I knew you'd come through.
But here on Earth, in an ordinary passenger vehicle, with a decent mid-tier($40-60) tire pressure gauge, I really don't have to worry about that difference, right?
Until I drive the car on Mars or somewhere...
