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Physics Investigation: How does insulation effect the loss of heat

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Introduction

Physics Investigation: How does insulation effect the loss of heat? In this investigation I am going to try and find out what difference it makes if you wrap newspaper round a beaker with hot water in it and see if the heat loss is different with different thickness layers of newspaper. I carried out a preliminary experiment and found out that by only increasing the layers of thickness by 1 layer each time, that wont make enough difference to make a good graph because the trends will be too similar. So I chose to increase the layers by five sheets each time. Apparatus: * Beaker * Stopwatch * Newspaper * Polystyrene * Thermometer * Kettle * Stand and clamp I will also take a number of safety precautions whilst conducting the investigation. I will ensure the kettle is used safely through out the experiment, and hot water is transferred securely. . I will use protection when handling the boiling tubes when the hot water is present. ...read more.

Middle

I will change the layers of newspapers on the beaker. I will get 6 beakers. I will record two at a time. I will put polystyrene on the top and bottom of the beakers when I have filled the beakers up with 150 ml of boiling water. There is a little hole in the polystyrene on the top of the beaker to stick the thermometer through. I will then take results every five minutes for a total of 30 minutes. There will be 6 readings taken for each newspaper layer range. I will record 6 different layers. 0 layers, 5 layers, 10 layers, 15 layers, 20 layers and 25 layers. This should give me a good range of results. I predict that the more layers of newspaper round the beaker, the less quickly the water will lose heat. I say these because the more layers there are the more air pockets there are to keep the heat in. If there are more air pockets the more hot air is trapped in the newspaper. ...read more.

Conclusion

60 61 62 64 63 64 18 59 61 61 63 63 63 19 59 60 60 62 62 62 20 58 59 59 61 62 62 21 57 59 58 60 61 62 22 56 58 57 60 60 61 23 55 57 57 59 59 60 24 55 56 56 58 58 59 25 54 55 55 57 58 58 Analysing evidence and conclusion: My results went down in a good trend. All apart from the 25 layers which cooled quicker than the 20 layers. All the results are clear that they gradually decrease in the graph, In a fairly straight line. The more they are insulated, the slower the temperature falls. It is because the newspaper traps air in between it and the beaker, this insulates the beaker and traps hot air from escaping. Evaluation: My results were good. I conclude that the more layers around the beaker, the slower the temperature falls. I could have measured the results more accurately, by taking more time and recording each result twice but I didn't have time. By William malbon. Physics coursework.doc - 2 - 20/03/02 ...read more.

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