4) The vertical, frictionless piston is moving down as the fluid cools (left image). The cooling then continues after the piston reaches the stops (right image), what two types of processes are occurring during this cooling process? (label under each image) Po Po

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.