I have attached my lab report. Please help me to write introduction and conclusi

Question

I have attached my lab report. Please help me to write introduction and conclusion.

Exper Linear Expansion Coefficient Theoretical consideration It is found that most solids expand when heated. The change in length, AL, of the solid is found to be directly proportional to the original length of the solid, Lo, and to the change in temperature, AT, of the solid. Stated mathematically AL, o LoAT Letting a be the proportionality constant, then o is called the coefficient of linear expansion. It is a constant for a given solid depending upon the material composition of the solid. Solving for a we see that a is the fractional change in length of the solid per unit temperature change. The temperature change is measured in Celsius degrees, and Lo is the length of the solid at 0°C. However, little error will be introduced into this experiment if Lo is taken as the length of the solid at room temperature. The change in length of the solid is very small. therefore, a is used in this experiment to measure the change in length, AL. When the metal rod expands in length, the dial indicator will register the change in length. water out steam in Expansion Chamber burner or water in hot plate (out steam. Materials Power Macintosh or Windows PC Vernier Temperature Probe Universal Lab Interface Logger Pro Steam generator L Expansion Chamber and Rods 2-1

Explanation / Answer

Introduction - It is found that most solids expand when heated. When heat is added to most materials, the average amplitude of the atoms’ vibration within the material increases. This, in turn, increases the separation between the atoms causing the material to expand. If the temperature change, is such that the material does not go through a phase change, then it can be shown that the change in the object’s length, , is given by the equation

L = LiT

where Li , is the initial length of the object before heat is added,

is the linear expansion coefficient of the material.

Here we see that L, is not only dependent on T, but also on the initial length of the object, Li . So, the longer the object, the greater change in its length.

In this experiment we have acquired the L , the T, and the Li , so if we rearrange equation one we can solve for the linear expansion coefficient and compare it to the theoretical value to calculate a percentage error for this experiment. we will use equation = L/ LiT to get coeffiecient of linear equation.

Conclusion: The purpose of this experiment was to confirm the accuracy of the linear expansion properties of solids discussed in the introduction section. The results acquired confirmed that this experiment was prone to some errors.

Possible sources of errors could have been acquired while measuring for the initial temperatures of the metals rods.

Another source of error could have possibly been in the measurement of length.

But if we ignore these small error then we get the value of linear expansion as expected.

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