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Heat Loss Investigation

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Introduction

Biology Coursework In this experiment, I will test different types of material and how they affect heat loss from the body. The materials I will use are; wool, cotton wool, cotton, felt, foam, polystyrene and newspaper. As it is difficult to accurately measure which materials stop heat loss from the body, I will instead measure heat loss from a conical flask. I will be testing which material insulates the best, and I will keep all the other variables constant. As 36.9�C is quite a low temperature I will use a higher one, 80�C, to test each material. The amount of water, as well as the starting temperature will be kept constant throughout; as will the size and shape of the conical flask. There will be a beaker around the conical flask, holding the insulator, so this test is on a constant volume, rather than mass of insulator. There will also be another flask with no insulator, but with all other variables constant. ...read more.

Middle

The reason air insulates is because it is a gas and a) has no free moving electrons and b) its atoms are spread far so it is harder for the heat to radiate. Each material has a different structure and this depends on whether it will insulate or not. For example: Wool has an almost honeycomb structure but these air gaps could be too big so the air will escape. Convection occurs because the air around is heated by the water and becomes less dense and therefore rises. The bung in the top of the flask stops this to a certain extent, however, large air spaces allow convection. Foam, when packed properly, has none of these and should be a good insulator. Radiation occurs through the foam, however, some may be reflected by the white, shiny colour, which best prevents against radiation. In the experiment, after the glass has been heated, the insulator will allow quite rapid heat loss as the insulator and air pockets are warmed. ...read more.

Conclusion

Boil water with a kettle, measure out 200cm� of this water. 2. Add it to a conical flask that is sat in a beaker and surrounded by one of the insulating materials, as shown above. 3. Record the initial temperature and the temperature at one-minute intervals for twenty minutes thereafter. 4. Repeat the steps 1-3 for each insulating material, (including with no material at all - this is the control). 5. Repeat the whole experiment 3 times to eliminate experimental error as much as is possible, and to give a number of readings to take an average from, giving a more accurate set of results. Preliminary Work ???????? ????????????????????? ???? ?? ??????????? ?? ????????? ? ?????? ?? ??????????? ?? ???? ???? ???? ??? Preliminary results prove that an insulated flask keeps the temp drop lower. They also show that Wool was the worst insulator and Foam was the best. Analysis As we can see from the results, all the materials provided some if not a lot of insulation. We can also see that as time increases, temperature decreases but not proportionally. If we look at the results we see that ...read more.

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