"An isothermal process is a change of a system, in which the temperature remains constant: ΔT = 0. This typically occurs when a system is in contact with an outside thermal reservoir (heat bath), and the change will occur slowly enough to allow the system to continually adjust to the temperature of the reservoir through heat exchange." I cannot understand this part. By adjusting does system comes to the temperature of outside thermal reservoir? https://en.wikipedia.org/wiki/Isothermal_process Thank you.