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The aim of this experiment is to investigate the affects on the rate of heat conduction under different insulations.

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Introduction

Physics coursework; Insulation The aim of this experiment is to investigate the affects on the rate of heat conduction under different insulations. Materials that prevent heat loss are called insulators. They can prevent three different types of heat loss; 1. Conduction 2. Convection 3. Radiation Conduction of heat occurs mainly in solids. This process is where vibrating particles pass their extra vibration energy to neighbouring particles. Convection of heat only occurs in liquids and gasses. Convection occurs when the more energetic particles move from the hotter region to the cooler region taking their energy with them. "Radiation of heat is sometimes referred to as infer-red radiation" (taken from school text book). Heat radiation can travel through a vacuum. This process is different from the other two; it travels in straight lines and at the speed of light. This is the only way heat can reach us from the sun. Heat radiation travels through transparent matter like air, glass, and water. No particles are involved in this process; it is the transfer of heat energy purely by waves. In this investigation I will be looking at conduction of heat through glass beakers. ...read more.

Middle

one layer covering the whole side of the beaker. I will also take a number of safety precautions whilst conducting the investigation. I will ensure the kettle is used safely throughout the experiment, and hot water is transferred securely. I will have to take into consideration that basic rules may be broken and pupils around me may run. This means that I will have extra careful that no-one bumps into me as it could be very harmful to others and me. In addition, if any spillage does occur I will have to clean it up as soon as possible and make others aware of it. I will be cautious when handling the beakers when the hot water is present. My hypothesis based on the fact that the following will affect the efficiency of the material as an insulator, 1. colour 2. thickness 3. density The lighter the material in colour the better insulator it will be. I predict this because light colours are poor radiators, therefore they will reflect the heat back into the beaker if the lighter colour is on the inside. The darker materials will absorb the heat and release it the other side so is a bad insulator and will cause rapid heat loss. ...read more.

Conclusion

To my surprise the black card was seriously ineffecient. The result marked in red in the polystyrene column at 15 minutes was the only anomalous result I could find. This may have been because of human error. scatter graph on the next page. In evaluating my experiment and the overall investigation I felt I achieved my aim and my results enabled me to clearly conclude from the experiment. In correlation to my method i feel that I completed the experiments clearly, safely, and with small difficulty and feel that it satisfied my aim. As far as I can see all my results are highly accurate and only one was anomalous. If I conducted the experiment again I would use a wider variety of materials and take each experiment at a time. I would also increase the amount of times I did the experiment for each material to gain an average. I would do this because then I would be able to gain more accurate and reliable results. I would extend my experiment further by making sure that I investigated further into anomalous results and maybe trying to find a cooling rate or point of each insulation. Overall I think my investigation was successful as it achieved the requirments of the set task and aim. It gained reliable results and clearly showed a trend. ...read more.

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