Coefficient of Expansion of Copper
Essay by Aileen Jane Salinasal • April 3, 2019 • Lab Report • 732 Words (3 Pages) • 649 Views
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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