Methods

The samples were categorized as liquids and solids. Under the liquid samples were the subcategories of water and liquids other than water. Subcategories for solid samples were regularly-shaped and irregularly-shaped. All in all there were seven samples, namely water, isopropyl alcohol, coconut oil, wooden block, marble, pebbles, and an unknown liquid sample. For the density of water, a clean and dry 100ml graduated cylinder was weighed and 50ml of water was added into the graduated cylinder. The graduated cylinder with water was weighed again to get its mass. For the density of a liquid other than water, a clean and dry 10ml graduated cylinder was weighed and 5.0ml of the different liquid samples (isopropyl alcohol, coconut oil and an unknown liquid) were added to the graduated cylinder. Again it was weighed to get the mass of the liquid samples. For the density of the rectangular solid, a metric ruler was used to measure the length, width, and height of it to the nearest tenth of a centimeter. The rectangular solid was weighed to the nearest tenth of a gram. For the spherical solid, a metric ruler was used to measure the diameter of it to the nearest tenth of a centimeter. Then it was weighed to the nearest tenth of gram. For the density of the irregularly-shaped solids, a clean and dry watch glass was weighed and pieces of pebbles were put to the watch glass and weigh again. On the other hand, a 30ml of water was added to 100ml graduated cylinder, the pebbles were added to the container and the final volume was determined. A triple beam balance was used to determine the masses of all the samples. To get the mass of the sample, the mass of the container was subtracted to the mass the container with the sample. In determining the volume, four techniques can be used – measuring through graduated cylinder (direct measurement), measuring the length, width and height, measuring the circumference, and lastly, water displacement. All except the first method for