# Coefficient of Expansion of Copper

Essay by   •  April 3, 2019  •  Lab Report  •  732 Words (3 Pages)  •  500 Views

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V. RESULTS

Table 1. Coefficient of Expansion of Copper

 Record of Data Specimen Trial I (Lever type) Trial II(Micrometer type) Length of rod Lo 60 cm 60.2 cm Temperature of rod To 26°C 26°C First reading of screw S1 60 cm 59.865 cm Second reading of screw S2 60.04 cm 59.910 cm Therefore, elongation e 0.04 cm 0.045 cm Final Temperature T 67°C 69°C (Computed)(Accepted value)% difference 1.63x10-5 1.75x10-5 1.9x10-5 1.9x10-5 14.21% 7.9%

Table 2. Coefficient of Expansion of Aluminum

 Record of Data Specimen Trial I (Lever type) Trial II(Micrometer type) Length of rod Lo 59.80 cm 59.815 cm Temperature of rod To 26°C 26°C First reading of screw S1 59.80 cm 59.815 cm Second reading of screw S2 59.83 cm 59.847 cm Therefore, elongation e 0.03 cm 0.032 cm Final Temperature T 50°C 50°C (Computed)(Accepted value)% difference 20.9x10-6 22.3x10-6 23x10-6 23x10-6 9.13% 3.18%

VI. DISCUSSION

Table 1 shows the data that were gathered for the purpose of computing the coefficient of linear expansion of the copper rod. The lever-type linear expansion model was used in the first trial. The initial length of the rod at an initial temperature of 26°C was 60 cm. When the rod was heated, it expanded by 0.04 cm at 67°C. Given these measurements, the final length of the rod was computed to be 60.04 cm at a temperature change of 41°C. The coefficient of linear expansion of the copper rod was then calculated by using the formula . The computed value of the coefficient of linear expansion for the copper rod was 1.63🞨10-5. The percent error or percent difference of the computed value to the accepted value of 1.9🞨10-5 was calculated to be 14.21%. For the 2nd trial, the micrometer-type linear expansion model was used. The first reading of the screw was 59.865 cm at an initial temperature of 26°C. When heated, it expanded by 0.045 cm to 59.910 cm at a temperature change of 43°C. The computed value for the coefficient of linear expansion was 1.75🞨10-5, with a percent error of 7.9%. This shows that using the micrometer-type apparatus is more accurate than the lever-type.[pic 1]

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