A thermally insulated cylinder is closed at both ends and is fitted with a frictionless, heat-conducting piston that divides the cylinder into two parts. Initially the piston is clamped in the center with V = 1 liter of air at T0 = 300◦ K and P0 = 105 Pa on one side, and V = 1 liter of air at T0 = 300◦ K and pressure 2P0 on the other. After the piston is released the system comes to equilibrium with the piston at a new position.
I have already solved the problem and obtained the final pressure, temperature and volumes, but how can I describe a process like this? Obviously the process is isothermal, the net change in energy is zero and entropy increases, but is this process quasi-static or not? Any help or explanations will be appreciated.