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Comparing the densities of glass and sand

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Introduction

Comparing the densities of glass and sand Aim: My aim for this experiment is to determine as precisely as possible, with the apparatus provided, the densities of glass and sand Apparatus: The apparatus I will be provided for this experiment is as follow:- * Glass block * Ruler * Plastic cup * Dry sand * 250ml measuring cylinder * Access to balance and water Predictions: For this experiment I will predict that the densities of glass and sand will be equal. This is because glass is made from sand. So if the experiment is performed accurately both the densities will be equal. Method: * At the start of the experiment we set up all the equipment. After that we measured the glass block. In order to make our measurements accurate we used a vernier caliper instead of a standard 30cm ruler. We used the vernier caliper to measure the height, the width and the thickness which are the 3 measurements we need in order to calculate the volume of the glass block. ...read more.

Middle

* To find the volume we found out the difference between the reading of the cylinder with only pure water and the reading when we added the sand into the cylinder. * Calculated the density using the formula Density = Mass/Volume. * Compare the two densities of sand and glass. Diagram: Results: Measurements of glass block: Height (cm) 1.87, 1.90, 1.90 Average Height (cm) 1.89 Width (cm) 6.57, 6.57, 6.57 Average Width (cm) 6.57 Length (cm) 11.42, 11.42, 11.42 Average Length (cm) 11.42 Volume (cm3) 1.89 x 6.57 x 11.42 = 141.805566 Mass (g) 347.50 I used the values in this table to find the density of the glass block. I found the density using the following formula Density (g/cm�) = Mass (g) / Volume (cm�) = 347.50/141.805566 = 2.4504444816 = 2.45 g/cm� (3 significant figures) Measurements of sand: Mass of sand (g) 170.50 Volume of water (cm�) 80 Volume of water + sand (cm�) 148 Difference between volume of water and volume of water + sand (cm�) ...read more.

Conclusion

Evaluation The results show that the density for glass and sand are similar therefore confirming glass is made from sand. There was a small difference of 2.54% between the two densities. This shows that the experiment was not perfect. This may have been caused due to the fact the glass block was not a perfect cuboid shape. This would have caused the mass to be less than it should be according to the calculated volume. Therefore the density would not be correct. Also due to the fact it was not a perfect shape, the measurements of the lengths width and height was not accurate. An average had to be taken. This shows that it is probably not accurate. To overcome this a vernier callipers was used and multiple readings taken. Also while measuring the volume of sand; there were bubbles in the measuring cylinder which would cause the reading to be increased. The error causes the actual density to be wrong. Therefore due to these errors, the differences between the two calculated densities could have been increased from what it should be. Majid Khan - Physics ...read more.

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