Question

The work done by the system is —

Answer 1

The work done by the system is —

$W=\int d W=\int_{V_{i}}^{V_{f}} P d V$

Here $V_{i}$ and $V_{f}$ referred to the change in volume from state $i$ to state $f$.

During the change in volume the pressure and temperature of the system also change it is scalar quantity. It's SI unit is joule. it is path dependent. In P-V diagram (indicator diagram) the area under P-V curve represents work done.