 #1
 304
 14
I think that dU = Cv dT can only be used when the volume of the gas is constant.
Similarly, Cp = dQ/dT can only be used when the pressure is constant.
Such as
We have Cv=dQ/dT
and ΔU=Q+W
dU=Q+pdV
Therefore,
dU/dT = dQ/dT only when dV is zero
Why am I wrong? Thank you so much for your help. The original proof is below.
Similarly, Cp = dQ/dT can only be used when the pressure is constant.
Such as
We have Cv=dQ/dT
and ΔU=Q+W
dU=Q+pdV
Therefore,
dU/dT = dQ/dT only when dV is zero
Why am I wrong? Thank you so much for your help. The original proof is below.
Attachments

25.6 KB Views: 21,464