The calculated value of the coefficient of linear expansion compared to the standard theoretical value differs. The difference is not dramatic however, it can be said that some inaccuracy definitely occurs. The percent error calculated for aluminum was 29% and for copper was 20%. Since for both materials, the percent error is over 20%, a substantial error must have occurred. Possible reasons for this error are inaccuracy of measuring the values of length and temperature. It is also quite possible that the rods have not been screwed correctly. This reason may be the most profound in our experimentation, because our group did have trouble making sure the ends were tight enough but not too tight. Screwing to the dial gauge was most difficult and most likely lead to most error because it was difficult to conclude when the two points were “just touching.” Incorrect dial readings would have lead to an inaccurate representation of length change, further influencing the coefficient of linear expansion. Temperature change seemed to be quite accurate as the initial was room temperature and it leveled off at approximately 99.0
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Vector Space,Aluminium,li,Coefficient of thermal expansion,purpose of this laboratory