pressed against the adjustable screw and the flat end is pressing against the

Pressed against the adjustable screw and the flat end

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pressed against the adjustable screw and the flat end is pressing against the tip 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. RESULTS 4.1 EXPERIMENTAL DATA Rod Material Initial Temperature (C) Final Temperature (C) Temperature Change (C) Initial Reading (mm) Final Reading (mm) Length Change (mm) Length (cm) Copper 20 92 72 9.3 19.4 10.1 60.4 Steel 35 91 56 9.4 19.5 10.1 60.4 Aluminium 36 95.5 59.5 9.3 19.4 10.1 60.4
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Rod Material Experimental α (10-5/C) True α (10-5/C) % Error Copper 2.322479765 1.7 36.62 Steel 2.986045412 1.2 148.84 Aluminium 2.810395681 2.2 27.75 DISCUSSION 1. 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. CONCLUSION In this lab we determined that calculating the coefficient of linear expansion was an accurate form of measurement even if there were slight differences. There were 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.
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