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Thread: pv concept regarding thermo

  1. #1
    Jan 2009
    Ontario Canada

    pv concept regarding thermo

    A gas expands according to the equation pv=1000. where p is pressure in kPa and v is specific volume m^3/kg. If the gas pressure drops from 1000 to 500kPa, how much work was done by the gas??

    Ok I am new to thermo and given a question and can't figure it out.
    Do I use net flow work = p2v2-p1v1??
    Answer is 693.1 kJ/kg.

    or is it w-p delta v?
    I am not sure.
    Any help or direction would help thanks
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  2. #2
    Senior Member
    Mar 2010

    Re: pv concept regarding thermo

    I think that

    $\displaystyle A=\int_{v1}^{v2} \; p \: dv \: . $
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