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Investigation to See How Insulation Affects Heat Loss

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Introduction

Investigation to See How Insulation Affects Heat Loss We are trying to find out how layers of insulation wrapped round a beaker with hot water in will affect the heat loss in five minutes. The are six different variables that we could alter such as amount of water, temp of water, size of beaker, if the beaker has a lid, if the beaker is on a heat proof mat and the temp of the class room (which we cannot control). We are going to vary the layers of insulation from no layers to four, we are also going to do the experiments without a lid and one with but both times the beaker will be placed on a heat proof mat. We are going to use 125ml of hot water in a 300ml beaker. We are going to the experiment twice then get an average measure the heat loss from when the temp has got to 70�C and is not rising any more we will then start the stopwatch. ...read more.

Middle

Results The results were measured from 70�C and we measured the heat loss. Results for experiment without lid. No insulation 1 layer 2 layers 3 layers 4 layers 1st 11�C 11�C 9�C 9�C 8�C 2nd 11�C 9�C 8�C 101/2�C 9�C Average 11�C 10�C 81/2�C 93/4�C 81/2�C Results for experiment with lid. No insulation 1 layer 2 layers 3 layers 4 layers 1st 6�C 5�C 4�C 4�C 4�C 2nd 8�C 6�C 5�C 4�C 2�C Average 7�C 51/2�C 41/2�C 4�C 3�C I have highlighted two results that seemed slightly out of sequence. These results seemed out of sequence because the results had steadily declined then the temperature jumps up by 21/2 �C from 8�C to 101/2�C so that affected the average. Investigation to See How Insulation Affects Heat Loss Conclusions The first graph had one odd result, which was experiment two insulation three. The result was 101/2�C which kind off made its line and the averages line on the graph look out of place. ...read more.

Conclusion

Investigation to See How Insulation Affects Heat Loss Evaluation My results were not very accurate on the first graph but they improved on the second graph. There was one odd result which I cannot explain but it may have been something to do with classroom temperature or a missread thermometer. We had two problems with our method which were, when you poured the water in to the beaker you had to wait for the temerature to drop to 70�C before you could start the stopwatch another problem was that we couldn't get the lid to sit properly on the beaker. We started the experiment only intending to mesure the temperatur difference for without a lid, but then dicided to do the experiment with the lid aswell so we could see how much convection made a difference. If I were to do the experiment again I would do the amount of insulation to eight to see where it stoped making a difference I would also try to measure out the hot water more acurately, also I would start the stopwatch at 80�C. ...read more.

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