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I ran into a problem trying to calculate the absolute pressure of an isolated system. I was given that the gauge pressure in a tire is 200kPa or 2 bars. To get the absolute pressure I would have to add 101.3kPa correct or would I have to add 100kPa because that would be adding 1 bar.

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  • $\begingroup$ Well, gauge pressure is relative to ambient. What is your ambient? Some of us live places where normal pressure comes nowhere near sea level. So, I would only add 80-odd kPa... $\endgroup$
    – Jon Custer
    Dec 28 '15 at 16:33
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Its not clear what are you exactly asking! But I guess you are screwing with conversion factors. 1 bar is 1.01325 atm and inversly 1 atm is 0.987...bar. So for 1 atm you need to add 0.987bar.

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