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What factors affect heat loss?

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Introduction

What factors affect heat loss? PROBLEM I have been asked to investigate the link between colour and heat loss. Does the silver or the black cup lose its heat faster? HYPOTHESIS I think that the black cup will lose heat faster then the silver cup. BACKGROUND INFORMATION CONVECTION The hot water in both cups will have convection current in them. The hot water will rise and sink as the water begins to cool. This means the heat energy is being passed on to the metal cup over most of its inner surface. CONDUCTION The metal cups will get hotter as a result of the heat energy inside the cup. The water will pass on this heat energy due to the fact that metal is a good conductor of heat. The heat energy will be conducted throughout the metal cup to the outer surface where it will be transferred to the air around the cup as radiation. RADIATION Hot objects (i.e. the metal cup) emit mainly Infrared radiation, and the hotter the object the more radiation it will emit. How much radiation the object emits will depend on the surface. The black cup had a dark matt surface and therefore will emit more radiation. ...read more.

Middle

36.4 9 75.7 75.6 65 34.5 36 10 74.3 74.3 66 34.2 35.8 11 72.8 73.1 67 33.9 35.5 12 71.3 71.7 68 33.6 35.2 13 69.8 70.4 69 33.3 34.9 14 68.7 69.3 70 33 34.6 15 67.5 68.3 71 32.7 34.4 16 66.3 67.1 72 32.4 34.1 17 65.2 66.1 73 32.1 33.8 18 64 65.1 74 31.9 33.5 19 62.9 64.2 75 31.6 33.2 20 61.8 63.1 76 31.5 33 21 60.8 62.1 77 31.2 32.7 22 59.7 61.2 78 31 32.5 23 58.8 60.2 79 30.7 32.2 24 57.8 59.4 80 30.5 32 25 57 58.5 81 30.2 31.8 26 56.1 57.7 82 30 31.6 27 55.2 57 83 29.8 31.4 28 54.4 56.2 84 29.5 31.2 29 53.6 55.4 85 29.3 30.9 30 52.8 54.7 86 29.1 30.7 31 51.9 54 87 28.9 30.5 32 51.1 53.2 88 28.6 30.3 33 50.4 52.5 89 28.4 30.1 34 49.6 51.8 90 28.2 29.9 35 48.9 51 91 28 29.7 36 48.2 50.4 92 27.9 29.5 37 47.6 49.7 93 27.7 29.3 38 47 49.1 94 27.4 29.1 39 46.3 48.5 95 27.3 28.9 40 45.7 47.8 96 27.1 28.6 41 45.1 47.3 97 26.9 28.4 42 44.5 46.7 98 26.7 ...read more.

Conclusion

21.3 22.3 153 21.3 22.3 154 21.2 22.2 155 21.2 22.2 156 21 22.1 157 21 22 158 21 22 159 21 21.9 160 20.9 21.9 161 20.9 21.8 162 20.8 21.8 163 20.7 21.8 164 20.7 21.7 165 20.6 21.7 ANALYSING As the time increased the temperatures of both cups decreases. The black cup lost heat faster then the silver cup. The silver cup lost heat slower then the black cup because its light reflects heat back into the cup keeping the water warm. Both cups dropped down a lot in temperature at the beginning then they slowed down near the end. EVALUATING My original hypothesis was correct and the black cup lost heat faster then the silver cup. In conclusion the black cup lost heat faster then the silver cup. There is an anomaly, which is a strange result in the graph, which is a point in the graph where the Silver cup lost heat faster, then the black cup. This was at 85 degrees Celsius. There are some improvements that I could do to make the practical more reliable. For example I could do the same experiment a few times to see if the results are about the same. Ritatsu Thomas ...read more.

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