 After equilibrium, heat flow into the system once again equals the heat flow out, and temperatures at each point inside the system no longer change.Once this happens, transient conduction is ended, although steady-state conduction may continue if heat flow continues.If changes in external temperatures or internal heat generation changes are too rapid for the equilibrium of temperatures in space to take place, then the system never reaches a state of unchanging temperature distribution in time, and the system remains in a transient state.