Sketch on a P diagram the process that the air inside a pistoncylinder undergoes during an isothermal

Sketch on a P–ν diagram the process that the air inside a piston–cylinder undergoes during an isothermal (constant-temperature) expansion reducing the pressure by 300 kPa. Energy is then transferred as heat either into or out of the system. Assume that air obeys the ideal gas law. Derive the expression for the net amount of energy transfer as heat either in terms of pressure and volume, or temperature, volumetric expansion ratio and determine its direction.