- #1

Clara Chung

- 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.