Experiment_7- - Page 1 LAB REPORT EXPERIMENT#7 COEFFICIENT...

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  Page 1 LAB REPORT EXPERIMENT #7 COEFFICIENT OF LINEAR EXPANSION DATE PERFORMED: MAY 16, 2007 BRYAN (DAEJIN) KIM LAB PARTNER: ALFONSO HERNANDEZ
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  Page 2 Procedure: In this lab experiment we will be determining the coefficients of linear thermal expansion for several metals. We will also be reviewing error analysis and the importance of relative error. Most substances expand with an increase in temperature and contract with a decrease in temperature. In this experiment the coefficients of expansion for several metal rods will be determined by heating them, and measuring, by means of a micrometer screw, the corresponding change in length, ΔL. Data: Tube material Initial gauge position (m) Final gauge position (m) ΔL (m) R room (Ω) R hot (Ω) T room (°C) T hot (°C) ΔT (°C) Cu L= 0 0.0000862 0.0000862 96.9 10.80 26 80 54 Steel L= 0 0.0000653 0.0000653 107.6 9.42 23.5 84 60.5 Al L= 0 0.0001212 0.0001212 102.7 11.30 24.5 79 54.5 Calculations ΔL = αLΔT αCu= 0.0000862/(0.700 * 54) = 2.28 x 10^-6 C^-1 αSteel= 0.0000653/(0.699 * 60.3) = 1.54 x 10^-5 C^-1 αAl= 0.0001792 / (0.700 x 54.5) = 3.18 x 10 ^-6 C^-1
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  Page 3 1. First, we need to convert everything to the SI units for the lab.
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