To determine which process involves neither absorption nor release of heat by a system, we need to understand the characteristics of each given thermodynamic process.
From the descriptions above, the correct answer is the adiabatic process, in which there is no heat exchange with the surroundings. This means that heat is neither absorbed nor released by the system.
Therefore, the correct option is: adiabatic.
A real gas within a closed chamber at \( 27^\circ \text{C} \) undergoes the cyclic process as shown in the figure. The gas obeys the equation \( PV^3 = RT \) for the path A to B. The net work done in the complete cycle is (assuming \( R = 8 \, \text{J/molK} \)):
