What's the formula of gauge pressure?

PRESSURE FORMULA ABSOLUTE TO GAUGE?

  • when do you add or subtract gauge pressure to atmospheric pressure to get absolute pressure? Pabs = Patm +- Pgauge

  • Answer:

    Pabs = Patm + Pgauge Go back to the above equation, and it easy to see that, we always ADD gauge pressure to atmospheric pressure to get absolute pressure.

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You can do it whenever you like but it must be done when you are working with any of the gas equations like for example PV = RT where all quantities must be in absolute units.

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