1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Is absolute pressure same as gauge pressure?

  1. Nov 10, 2015 #1
    From what I have read:

    Gauge Pressure: The amount by which the pressure measured in a fluid exceeds that of the atmosphere.


    Absolute pressure: Total pressure at a point in a fluid equaling the sum of the gauge and the atmospheric pressures.

    So Absolute pressure= Patm+ P-Patm= P (Which is pressure in a fluid). Atmospheric pressure cancels each other in the equation.
  2. jcsd
  3. Nov 10, 2015 #2


    User Avatar

    Staff: Mentor

    Yes. So the answer to your question in the title is no.
  4. Nov 10, 2015 #3
    Why are you subtracting Patm from P? Pabs = Pgauge + Patmos.
  5. Nov 10, 2015 #4
    I support the question.
    avito009, The instruments measures the pressure actually measured the pressure difference. The gauge pressure is the difference between measured pressure and atmosphere.pressure and the absolute one is the pressure difference between measured pressure and prussure of vacuum (zero).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook