Two Work Functions

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Mia Navarro 1D
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

Two Work Functions

When do you know whether to use the w=Pext(Delta)V equation or the w=nRTln(Vf/Vi)?

Kailey Brodeur 1J
Posts: 34
Joined: Thu Jul 27, 2017 3:00 am

Re: Two Work Functions

The first equation is used to determine work done against a constant external pressure. If the pressure is changing, but the work is being performed by an ideal gas, then you can use the second equation.