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Homework Help: Question on finding absolute pressure?

  1. Jan 30, 2010 #1
    Hey, here's the question:

    "If a gauge reads -295mmHg where athmospheric pressure is 101.7 kn/m^2 and the vapor pressure is 2.8 kN/m^2, what is the absolute pressure?"

    I converted the gauge pressure to 39.36 kN/m^2 but where do i go from here??!?! I know the equation is p_gauge= p_absolute - atmospheric, but where do I factor in the vapor pressure?!?!?!?!?!

    Please help! Thank you :)
  2. jcsd
  3. Jan 31, 2010 #2


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    Staff Emeritus
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    Homework Helper

    I think your equation is correct. I'm reasonably sure that the vapor
    pressure is not a factor here. It seems that was included just to throw you off track.
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