Lab Report Coefficient of Linear Expansion of a Metal

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Lab Report Coefficient of Linear Expansion of a Metal Introduction Most solid materials expand upon heating and contract when cooled because it undergoes a change in the energy state of its molecules or atoms. According to the atomic perspective, the average vibrational amplitude of an atom increases as the temperature rises. Each material has a property called ¡§coefficient of linear expansion¡¨ that is indicative of the extent to which a material expands upon heating or contracts when cooling. The coefficient of expansion is re very important to all structures and foundation of buildings to avoid the possibility of collapsing. Objective The objective of this experiment is to calculate the coefficient of linear expansion of a metal. The change in length of several materials such as glass, brass, copper, stainless steel and aluminum will be determined and the corresponding coefficient of linear expansion would be calculated. GROUP #5 Metal (pyrex)Glass Brass Copper Steel Aluminum Data T1=27¢XC T2=95¢XC L1=0.6m T1=27¢XC T2=98¢XC L1=0.6m T1=27¢XC T2=98¢XC L1=0.6m T1=27¢XC T2=98¢XC L1=0.6m T1=27¢XC T2=98¢XC L1=0.6m t(s) ƒ´L(0.01mm) T (¢XC) ƒ´L(0.01mm) T (¢XC) ƒ´L(0.01mm) T (¢XC) ƒ´L(0.01mm) T(¢XC) ƒ´L(0.01mm) T (¢XC) 10 5 27 10 27 5 27 30 40 19 27 20 9 30 20 30 15 27 40 49 33 27 30 11 45 30 35 28 27 52 68 53 30 40 14 59 45 58 41 38 64 80 71 55 50 15 63 55 77 53 62 71 85 90 72 60 15 69 68 83 66 78 73 88 104 81 70 15 78 83 88 76 84 74 90 106 86 80 15 81 86 90 79 88 74 91 107 88 90 16 83 87 91 79 90 74 92 107 90 100 16 84 87 93 79 91 74 93 108 91 110 16 86 87 93 79 92 74 94 108 93 120 16 88 87 93 79 93 74 95 108 93 130 16 89 87 93 79 94 74 95 109 94 140 16 90 87 93 79 94 74 95 109... ... middle of paper ... ...llow metal tube was not well insulated, some steam and hot water were leaking out from both sides of the rubber jacket and also though the opening for the thermometer. The results of the data were slightly affected due to heat lost. After the first specimen rod was done, the percent deviation of glass, copper, stainless steel and aluminum have increased noticeably. One of the reasons is that the metal tube was not able to return back to its original temperature or its normal state within a short period of time, even though it was cooled down by running under the water. Another factor was that the thermometer also could not return to the room temperature. Conclusion The experiment was luckily conclused fairly similar to the accepted value. However, because only appoximation of datas and other source of errors, the accuracy of the data could be questionable.

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