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What is absolute reference pressure and absolute reference temperature

  1. Jan 8, 2009 #1
    What is "absolute reference pressure and absolute reference temperature"

    I am doinf a test about compressed air flow rate.
    There is a parameter called absolute reference pressure and absolute reference temperature.
    Are they 1.01bar and 273+20K?
     
  2. jcsd
  3. Jan 9, 2009 #2
    Re: What is "absolute reference pressure and absolute reference temperature"

    Those what you wrote 273+25 and 1.01bar are the called "standard" state,
    There is another one called the "normal" state which is 273 and 1.01,
    I dont know absolute can mean here.., probably one of the above two...
     
  4. Jan 24, 2009 #3
    Re: What is "absolute reference pressure and absolute reference temperature"

    Not sure but would relative pressure be a pressure relative to an absolute pressure, i.e absolute pressure "being that of space".. conventionally 0 Pa due to a void of particles..Although it does depend what kind of pressure you are talking about, space itself being is probably some form of energy resulting in a pressure "off" space. But i suppose that may beside the point.
    In your case, in the test, i would say the reference pressure is with respect to a vacuum. If the atmospheric pressure is adding to the absolute pressure, then you would have to substract the atm pressure (101.3 KPa ) from the relative pressure in order to obtain the absolute pressure (with respect to vacuum). The absolute reference pressure may be directly measured with respect to the vacuum by creating a vacuum.
    As for temperature, along the same lines i would say absolute temperature is temperature in kelvin, i.e with respect to absolute zero.
    As for : Are they 1.01bar and 273+20K? These would be relative pressure and temperature, relative to a "standard environment".
    May be wrong though..

    Does that help at all?
     
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