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pressed against the adjustable screw and the flat end is pressing against thetip of the dial gauge. 3.Note the initial temperature of the rof from the thermometer.4.Note the initial reading of the dial gauge.5.Put on the steam generator and allow the steam to enter the heating jacket till a few minutes after the rod atains a steady temperature indicated by the thermometer. Let this steady temperature be the final temperature.6.While the temperature is steady note the final reading on the dial gauge.7.Calculate the coefficient of linear expansion for the experimented rod.8.Repeat step 1 through 6 for the other rod.4. RESULTS4.1 EXPERIMENTAL DATARodMaterialInitialTemperature(C)FinalTemperature(C)TemperatureChange (C)InitialReading(mm)FinalReading(mm)LengthChange(mm)Length (cm)Copper2092729.319.410.160.4Steel3591569.419.510.160.4Aluminium3695.559.59.319.410.160.4
Rod MaterialExperimental α (10-5/C)True α (10-5/C)% ErrorCopper2.3224797651.736.62Steel2.9860454121.2148.84Aluminium2.8103956812.227.75DISCUSSION1.The values we calculated were fairly close to the standard value. The difference was small but that can be due to human error or inconsistencies with the materials we used for the experiment. Percent differences for each were:Copper: 6%Steel: 18%Aluminum: 22%6. CONCLUSIONIn this lab we determined that calculating the coefficient of linear expansionwas an accurate form of measurement even if there were slight differences. Therewere different readings for each metal rod. For instance, the aluminum rod had the largest difference in length. The data was determined to be accurate in the final calculations.