Hi, seems simple, but I'm struggling with this:

A gas in a closed system expands from an initial state of P1 = 5 bar and V1 = 0.1 m3 to state 2 where P2 = 1 bar. The pressure and volume are related during the expansion by PV = constant. Calculate:

Work done during expansion

I know that W = integral from state 1 to 2 of P.dV but am I integrating v2 - v1 and also p2 - p1, I'm not sure what I'm doing here.

I have calculated V2 as 0.5m^3, then I get a bit lost!!!

Many thanks. Fantastic.