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Originally Posted by DC_DEEP I understand what inches of mercury is. Standard pressure is 760 mmHg (about 299 inches). My question was, when pumers refer to 5 Hg, do they mean 5 Hg inside the tube, or 294 Hg inside the tube? An absolute pressure of 2 inches of mercury seems like it would cause some severe damage, whereas 297 would not... |
Wow, that is way over my head! lol!! I thought that the wikipedia entry could answer your question. I don't mean to be an idiot and make more work for you, but could you explain what you mean by absolute pressure? I pump a hell of a lot and would like to know exactly what is going on inside my tube. There is another number on the gauge though... 3in.Hg is also -10 kpa? Can that point you in the right direction?
Okay... I looked it up, kpa is a unit of measurement called the Pascal. Is -10kpa equal to -10% absolute atmospheric pressure?
Now I know why you were confused by the 5 inches of Mercury shit. It seems
that is the actual pressure that is
removed from the tube and the absolute pressure would be somewhere at -17% absolute atmospheric pressure inside of the tube for a reading of 5 inches of Mercury on the gauge? I might have fucked this conversion up though...