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How Does Insulation Affect the Rate of Cooling?

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Introduction

How Does Insulation Affect the Rate of Cooling? P PLANNING The Problem The problem which I intend to investigate is out if insulation affects the rate of cooling, and whether the amounts of insulation would affect the rate of cooling Scientific Background An insulator is any of various substances that blocks or slows down the flow of heat, they can only transfer energy slowly. Many materials make air as an insulator, because air is an excellent insulator. Air can reduce heat lost due to conduction. The material has to trap the air to get the best result. This is to avoid warm air escaping and taking the energy with it. Energy can be transferred in four main ways when you heat something: by conduction, convection, radiation and evaporation. In conduction the particles are joined together by bonds, when the material is heated the particles vibrate really fast, they have kinetic energy. A fairly still part in a cold part of the material can pick up vibration from an atom in a hot part of the metal. The energy is transferred from one particle to another very quickly. Soon particles from far away have more and more kinetic energy, heating the material. ...read more.

Middle

I will do the same for 1cm; 2cm and then ending with 3 centimetre of cotton wool. I will repeat my experiment, to make it more accurate and reliable, and compare it with another person. My overall results should be averaged so that it should be more accurate. Prediction I predict that insulation would affect the rate of reaction. The more cotton wool wrapped around the calorimeter, it would take longer for the temperature to fall. I think the results will look like this on the graph: Explanation This is because, air is a good insulator, cotton wool has tiny holes trapped with air inside it, and cotton wool has not got strong bonds like conductors which are mostly metals. They can only pass kinetic energy by the much slower method of bumping into each other. This means that cotton wool is a good insulator. O OBTAINING RESULTS Table of Results First results 0 centimetres 1 centimetres 2 centimetres 3 centimetres Time Temperature �c Temperature �c Temperature �c Temperature �c 0 100.0 100.0 100.0 100.0 2 72.0 73.0 78.0 80.0 4 63.0 65.0 75.0 78.0 6 60.0 63.0 70.0 73.0 8 57.0 60.0 67.0 70.0 10 55.0 57.0 64.0 67.0 12 52.0 55.0 62.0 65.0 14 50.0 52.0 60.0 62.0 16 ...read more.

Conclusion

Data The results were reliable, the reason why is because I repeated results, and averaged it out. Also there were not anomalies; therefore my results were accurate as well. Although factors which could have made my results not reliable could have been, the wind form the open windows, the temperature of the boiled water may not be the same readings at the start of the experiment, also the cotton wool may have not been exactly the correct size. I do not think that I can form a firm conclusion with them. Further Work Any other alternative experiments I would do to help me investigate the problem is to compare with other materials not only cotton wool, like newspaper. This is because I could see if changing the material for the insulation would change the rate of cooling. Extending the range of my experiment, by timing every one minute rather than two, and by having more layers of insulation would help me get a more reliable experiment because my results will be more accurate. However, I would need more time because it would take long to have a larger range. Although, the range which I have, is a good range to have as it is not too small or too big. ?? ?? ?? ?? Chinyere Akosim ...read more.

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