U = q + w
H= U + PV
I don't understand this isn't isn't PV the work of expansion term, so isn't this the same as w? So why is it added onto U in the second equation?
Also my lecture slides say: 'dU = dw + dq
=-pexdV + dq'
Why is the pexdV term minus? Since w = p△V, so shouldn't it be added on not taken away since in the first line dw is added on?
H= U + PV
I don't understand this isn't isn't PV the work of expansion term, so isn't this the same as w? So why is it added onto U in the second equation?
Also my lecture slides say: 'dU = dw + dq
=-pexdV + dq'
Why is the pexdV term minus? Since w = p△V, so shouldn't it be added on not taken away since in the first line dw is added on?