PHYSICS do materials such as cotton wool, dacron

PHYSICS do materials such as cotton wool, dacron

PHYSICS EXPERIMENTAL REPORT RESEARCH QUESTION: What affect do materials such as cotton wool, dacron filling and water have on the temperature change of hot, boiled water inside the cans over the time of 10 minutes? RATIONALE: The modification in this experiment is the type of insulating material used. Unlike the original experiment, cotton wool is used as the insulator instead of newspaper. This modification improves the experiment by testing the theory that low density, air trapping materials make good insulators, since the fibres in the wool trap air and prevents heat transfer through it. It is a much better choice for this experiment, as newspaper does not have air trapping features and has a higher density than cotton wool. This scientific theory is the reason for using cotton wool as the insulator. Like every experiment, there are risks and safety hazards that come with this experiment, however, they can be handled effectively. Getting burnt with boiling water was the main hazard of this experiment followed by the risk of dropping and breaking glass.

The risk of getting burnt with boiling water can be reduced by wrapping the beaker with paper towel when pouring the water into the cans and also being cautious at all times, to avoid running into people or objects. Dropping and breaking glass can be prevented by keeping beakers and thermometers in the centre of the bench at all times and away from the edge. PROCEDURE: Firstly, all the equipment was collected to conduct the experiment. 150ml of boiling water was measured with a beaker and poured into each of the three cans, using a funnel. The cans were then put into four separate two-litre ice cream containers.

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The insulating materials; cotton wool, dacron filling and water were placed in the space between the can and the ice cream container, surrounding the can tightly. One container had no insulator, as it was the control. Each container had a different insulator. The starting temperature was then recorded and the temperature of water in the four cans were recorded every one minute for ten minutes. After then ten minutes, the materials such as the cans, containers and thermometres were cooled and the experiment was repeated. Results were recorded.

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