Heat transfer has taken place because of the difference of temperature between two ends of sample bar (consisting of copper and stainless steel). From graph slopes of copper and stainless steel shows that drop in temperature per unit length in copper bar is less as compared to stainless steel, which indicates that copper has let more heat to be transferred through it. Similar result is given by the calculated thermal conductivities showing that copper thermal conductivity is greater as compare to stainless steel. A noticeable error exists between the calculated and theoretical thermal conductivity of copper.
It might have occurred by taking the reading from thermocouple 3 or 4 just before the steady condition was achieved. (As just 1K temperature difference more or less causes significant change in final thermal conductivity value). Other reasons for error in both stainless steel and copper thermal conductivity are taking density and specific heat capacity of water as constant in calculation, while these are temperature dependant factors. The thermal conductivity itself changes with change in temperature, this change have not been considered in calculation. Further, assumption of one dimensional flow and apparatus thermal symmetry has been made during
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