PROCESS.It is a thermodynamic process which takes place at constant volume.In isochoric a process, the work done is zero. The volume of the GAS remains constant.Isobaric processIt is also known as an isopiestic process.It is a thermodynamic process which takes place at constant pressure.Adiabatic processIt is a thermodynamic process in which there is no exchange of heat from the system to its surrounding neither during expansion nor during COMPRESSION, yet the temperature may change.For the adiabatic process to occur, the system must be perfectly insulated from the surrounding.A reversible adiabatic process is CALLED isentropic.Isothermal processIt is also known as a hyperbolic process.It is a thermodynamic process in which the temperature of a system remains constant.The thermal equilibrium is maintained because the heat transfer is very slow.The work done in this process is DUE to the change of net heat content of the system.