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Unformatted text preview: Hose St eam Generat or Ther mistor xpansion Base and Meter Sick Rod Micromet er Multit ester quipments Used in Experiment 301 ABSTRACT. The main focus of this experiment is to determine the coefficient of linear expansion of a metal rod and also to determine factors affecting the change in length in thermal expansion. To do so, two metal rods made from different materials were examined and tested for that principle. The length and the temperature of the rods were initially recorded using the resistance of the metal rods. Afterwards, the rod is heated by passing a steam in it using a steam generator. The change in length is measured using a micrometer. The post resistance and temperature were also recorded. After experimentation, we found out that temperature affects the dimension of an object. We also found out that aluminum has larger numerical value of coefficient of linear expansion than copper which means aluminum expands greater than copper. Apart from this, the obtained coefficient of linear expansion is compared to the actual value of each rod. We had obtained an error of 37% and 38% for aluminum and copper metal, respectively. INTRODUCTION Perhaps, in examining the strength of a bridge, civil engineers consider the temperature of the surrounding where bridge is to be constructed. For some time, its length might be shorter or longer than its actual length. Temperature can affect materials dimension. With relatively few exceptions, all objects expand when they are heated and contract when they are cooled, including the materials used in bridges. Once it is not considered, the project may lead to accidents and disaster especially when it is done in a extreme hot or cold place. This is the reason for putting expansion joints in the bridge. One of the basic properties of matter is the temperature. In lay mans term, it is the measure of the hotness or coldness of a certain body and is somewhat in line with the sense of touch. But by formally defining it, it is related to the thermal energy held by an object, which is the kinetic energy of the random motion of the particles composing it. Among other physical property of a material, temperature is said to be one of the most fundamental. Temperature affects the dimensions of a certain material. When an object is heated or cooled, it expands or contracts in all dimensions. It is known as thermal expansion. However, for practical reasons, scientists and engineers often focus on two different kinds of...
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- Spring '11