Measure The Metallic Cylinder Is Or Isn

Is the metallic cylinder made of Aluminum? Purpose: There is one set of the metallic cylinders which are different lengths but have the same type of metal. Determined the metallic cylinders are made of aluminum, should discovered the cylinder’s density then comparing with the other aluminum samples are known. According to the formula of density, which is “Density= Mass/ Volume”, that needs to get measuring the mass and volume. Beside the final results of the cylinders that do not know the metal should be, would explode if touching the water. That is, can not use the water displacement method to measure the volume of cylinders in a linear scale, since “Volume= ∏(rˆ2)h”. The way to compare the cylinder’s density with the other three aluminum samples (which are pellets, shots and strips), measure the mass and the volume of those samples; then graph the results. After the samples are graphed, rely on those couples of points then draw a standard line as the comparison. Procedure: ① Measure each of those samples which are pellets, shots and strips by the balance.(Sure being on the level) And record the results on the notebook. Make sure the values are in linear scale. ② Pour water into the linear cylinder, record the initial volume of the water. Make sure the value is in linear scale. ③ Put the Pellets in the cylinder, which has water, record the value of the final volume of Pellets and water. Make sure the value is in linear scale. Then pour both of water and Pellets out, dry the metals out. ④ Same as the step ②! ⑤ Put the Shots in the cylinder, which has water, record the value of the final volume of Shots and water. Make sure the value is in linear scale. Then pour both of water and Shots out, dry the metals out. ⑥ Same as the step ② or ④! Put the Strips in the cylinder, which has water, record the value of the final volume of Strips and water. Make sure the value is in linear scale. Then pour both of water and Strips out, dry the metals out. ⑦ Measure the diameter and height of the metallic cylinder with linear method and calculate volume.(Do the calculation on notebook) ⑧ Clean up the lab station. Discuss the results with the lab partners then calculate the final volume of samples. And get the density of samples.

Data 1(Table): The class’ data of samples’ density Measuremen Mass (g) t Name Shots Average of Shots Pellets Average of Pellets

Strips Average of Strips

43.835 12.790 40.245 32.290 63.310 16.850 40.08 18.095 18.120 19.455 12.900 15.560 16.826

Volume (mL)

Density (g/mL)

16.5 5.0 15.0 12.2 24.0 6.5 15.25 7.5 4.0 8.0 5.5 6.0 6.2

2.7 2.6 2.7 2.7 2.6 2.6 2.6 2.4 4.5 2.4 2.3 2.6 2.8

Data 2(Graph):

Date 3(Table): Diameter(cm) Radius(cm)

Height(cm)

1.52

7.01

0.76

Volume= ∏(rˆ2)h (mL) 12.72

So far, graphing the volume after cylinder on the aluminum density graph, by marking the volume of the cylinder on the vol. axis going up to standard line and to the left until it hits the vertical mass axis. The resulting mass will be our predicted cylinder mass. The result is 33.9g. Then measure the mass of cylinder on the balance, find out that the result is 38.20g. Predicted=33.9g Actual=38.20g The difference: |33.9g - 38.20g |= 4.30g

Conclusion: From the results of the cylinder on the graphing data, and the actual value of cylinder which difference is 4.30g. It is closed to the predicted value that calculated. The reason of the difference between the predicted value and the actual value might be measurement is not exactly. Improve the problem, should get the much exact measurements and repeat the steps of the lab again.