There are many similarities between heat and work.
The heat and work are both transient phenomena. The systems do not possess heat or work. When a system undergoes a change, heat transfer or work done may occur.
The heat and work are boundary phenomena. They are observed at the boundary of the system.
The heat and work represent the energy crossing the boundary of the system.
The heat and work are path functions and hence they are inexact differentials.
Heat and work are not the properties of the system.
Heat transfer is the energy interaction due to temperature difference only. All other energy interactions may be called work transfer.
The magnitude of heat transfer or work transfer depends upon the path followed by the system during change of state.
