\(\frac{{P}_{i}}{{P}_{f}}= \frac{{V}_{f}}{{V}_{i}}^\gamma \)

\(\frac{{P}_{i}}{{P}_{f}}^{1/2} = \frac{{V}_{f}}{{V}_{i}}\)

I was hoping someone might be able to tell me how they've done this or the rule to use etc

Thanks,

Sonicmaths
May 28, 2017