Thermodynamic processes overview
A thermodynamic process is the transformation of a system from an initial state to a final state. This transformation is accompanied by changes in the pressure, volume and temperature of the system.
A state is a set of values of physical quantities (e.g. volume, pressure, temperature) that describe the properties of a system.
Thermodynamic processes are represented by pressure-volume (p-V) lines/curves. They are often drawn with arrows indicating the path taken.
Several connected p-V lines/curves are often drawn on the same axes to form a cyclical process.