You are here
ABOUT Work done by a pressure applied to a system
I have one question about work done by a pressure applied to a system. The book of Thermodynamics often always present pdV (where dV is the change in the volume of the system. )but never Vdp, Why is that? Is it because we don't treat p as a variable? In a grand canonical ensemble is pressure constant for any system?
Acording to Thermodynamics first law, du=dq-dw , where dw denotes work done by pressure and external force. dw=pdv+dw' . dq=Tds (Thermodynamics second law)
so, dU=TdS-Pdv-dw'
finally, dG=vdp-sdT-dw'
if we can treat p as a variable, then vdp denotes what?
- Lianhua Ma's blog
- Log in or register to post comments
- 2546 reads
Recent comments