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...I think you guys are talking about (say for example) xBarabs and xBarg -which stands for absolute pressure (including atmospheric) and gauge pressure (above atmospheric) respectively.
Must admit I usually never deal with abs pressure normally untill I came across MAP in car set-ups -I work with hydraulics mainly up to 400Barg (or about 401Barabs at MSWL) most of the time so I never really thought about influences of atmospheric pressure much before. Car stuf it teeny tiny pressures but the effect is huge in comparison I guess. LoL
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