Determination of Density Essay

Purpose To determine the densities of aluminium and coat cylinders Density is the relationship surrounded by the mass of an object and its volume. Sometimes constriction can be easy to sense. If two objects rush exactly the same shape and size, the denser one may witness heavier. If their densities are close together, it can be hard to tell the difference. It gets really tough if you are dealing with materials that have really different sizes or very different shapes. The only way to decide the density of an object is to measure its mass and its volume, then divide. Ex. Density= grass/Volume ProcedureFor Aluminum1. turn over the aluminum cylinders individually on the analytical balance to the nearest 0.0001g and show the weights 2. With a vernier caliper, measure the diameter of each cylinder to the nearest 0.01cm and record 3. Again, using the vernier caliper, measure the length of each cylinder to the nearest 0.01cm and record 4. Compute the volume of each cylinder by usi ng the radiation diagram V= (3.14d2h)/4 For Zinc1. Weigh the zinc cylinders individually on the top loading balance to the nearest 0.01g, and record the weights 2. Place enough irrigate in a 100mL graduated cylinder to cover the object. Record the volume of water to the nearest 0.1mL by reading the bottom of the meniscus 3. Place the zinc cylinder in the graduated cylinder. Read the new volume and determine the volume for each piece of zincDataDensity of ZincMass1 104.0168gVolume1 18mLDensity1 5.7780g/cm3Mass2 92.8178gVolume2 15mLDensity2 6.1876g/cm3Mass3 72.2115gVolume3 10mLDensity3 7.2215g/cm3Mass4 55.3077gVolume4 9mLDensity4 6.1453g/cm3Mass5 35.2653gVolume5 7mLDensity5 5.0379g/cm3 medium Density 6.079g/cm3Density of AluminumMass1 26.48gVolume1 6.28mLDensity1 4.22g/cm3Mass2 21.50gVolume2 5.01mLDensity2 4.30g/cm3Mass3 17.58gVolume3 4.14mLDensity3 4.25g/cm3Mass4 13.10gVolume4 2.92mLDensity4 4.48g/cm3Mass5 8.68gVolume5 2.04mLDensity5 4.25g/cm3Diameter = 1.025cmAverage Density 4.29g /cm3ConclusionsThe densities of both objects were successfully determined. The average density of the aluminum cylinders was 4.29g/cm3, and the density of the zinc cylinders was 6.079g/cm3. Both of these values seem reasonable, and the zinc seems to be slightly heavier than the aluminum. The density of the zinc cylinders was found using the volume by displacement method, and the volume of the aluminum cylinders was found by the formula method V= (3.14d2h)/4. Problems with the equipment may have possibly introduced error into the measurements.The 100mL graduated cylinder used to find the volume of the zinc cylinders was only marked in 10mL increments, requiring estimation for levels in between. The volume of the aluminum cylinders required the use of the vernier caliper to measure the diameter and the length of each cylinder. Improper use of the vernier caliper may have change the measurements received for the aluminum cylinders. The error introduced by these problems was slight, ho wever, and the calculated densities for both objects are probably quite reliable.