[Dev]

Hi.
Well, I started off believing that W = I PdV.
It was someone who suggested that W is actually I d(PV)

The thing that would make me happiest is finding out W = I PdV,
but no one here who has posted before this said that W = PdV. They always added that this is true only when pressure is constant.
What I need to hear is that W = I PdV for everything.

[curiouscat]

The thing that would make me happiest is finding out W = I PdV,
but no one here who has posted before this said that W = PdV.

Re-read my Reply#8 in this thread above.

They always added that this is true only when pressure is constant.
What I need to hear is that W = I PdV for everything.

I'll say it. But I may be wrong.

[Dev]

While I wish you wouldn't have said that last part, I'm going to take it.

W is indeed equal to I PdV for everything.
Thanks.

[Ali Durrani]

You are confusing 2 or three processes taking place on or by the system,
      the correct equation is for non isenthalpic process
combining 1st and second law of thermodynamics
             dH=dU+pdV+Vdp
this can be easily transformed from equation of enthalpy
        H=U+pV
       taking differential operator on both sides
       dH=dU+d(PV)
       dH=dU+pdV+Vdp
work can also be written in terms of enthalpy (In case of Steam Cycles)
       dW=H-H=dU+pdV+Vdp
               2  1