Experiment 1

# Experiment 1 - ABSTRACT The experiment entitled Linear...

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ABSTRACT The experiment entitled “Linear Expansion” aimed to determine the coefficient of linear expansion of a metal rod, and determine the factors affecting the change in length in thermal expansion. The students prepared the material given and preceded to the experiment proper. The experiment made use of an expansion base set-up and two different metal tubes one at a time. The first metal tube is copper and the other is aluminum. The experiment is started with a preheating of water to produce steam. Afterwards, the experiment proceeded in determination of initial length and temperature followed by the change in length and temperature. The coefficient of linear expansion is computed, as well as, the percentage error. The result yielded a value of coefficient of linear expansion of 0.0000231 for copper having 37.5% error and 0.0000331for aluminum having 39.2% error. Data analysis revealed that a certain expansion will occur if an object was heated. In addition, the final temperature is not 100°C since it is in a non-ideal condition. Moreover, the values of coefficients of linear expansion of the actual are not equal to the experimental. Results also revealed that there is a direct proportionality between the change in temperature and in length. INTRODUCTION When a substance is heated, the tendency is for the atoms and molecules of that substance to be excited, thus, it will move faster and farther until it became stable again. This movement of atoms causes an expansion of some physical aspects of the substance. All states of mater (solids, liquids, gases, and plasmas) with little exceptions, expands when heated and contracts when cooled down. Though the expansions are somewhat unnoticeable for the naked eye, careful observation can detect them. One practical application of this is when opening the lid of a jar. One often heat the lid of the jar in order to open it, this phenomena is explainable by thermal expansion. Once the lid is heated the lid expands a very minimal amount that it loosens its tight grip with the jar. One of these thermal expansions is the expansion of length of a substance, the linear expansion. Linear expansion is the change in length due to the change in temperature. This experiment sought to determine the coefficient of linear expansion of a metal rod, and determine the factors affecting the change in length in thermal expansion. Based from the nature of the experiment, it was hypothesized that if the steam generator contains water, then the final temperature of the tube should be 100°C. In addition, if heat is applied, then there must be a corresponding measurable length that the solid expands. Moreover, if the materials used are aluminum and copper, then the coefficients of linear expansion obtained from the experiment must equal the actual coefficient of linear expansion of aluminum and copper. MATERIALS AND METHODS

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Experiment 1 - ABSTRACT The experiment entitled Linear...

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