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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 silver cup will retain the heat for a longer period of time than the black cup, I think this because the black cup will absorb the heat, where as the silver cup will reflect the heat back into the cup causing the black cup to cool down faster than 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) ...read more.

Middle

This will make it more accurate because with the use of the computer it is 99.9% accurate and the is no gap for human error. Results 2 Elapsed Time Temperature Temperature 54 38.5 40.2 Minutes �C �C 55 38.1 39.8 0 91.5 84.6 56 37.7 39.4 1 89.4 85 57 37.3 39 2 87.6 85.6 58 36.9 38.7 3 85.8 84.2 59 36.5 38.2 4 84 82.8 60 36.2 37.8 5 82 81 61 35.8 37.4 6 80.2 79.5 62 35.5 37.1 7 78.7 78.3 63 35.2 36.7 8 77.2 76.9 64 34.9 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 ...read more.

Conclusion

197 19.4 20.2 142 21.9 23.1 198 19.3 20.1 143 21.8 23 199 19.3 20.1 144 21.8 22.9 200 19.3 20.1 145 21.8 22.9 Total drop 72.2 64.5 146 21.7 22.8 147 21.6 22.7 148 21.6 22.6 149 21.5 22.5 150 21.4 22.5 151 21.4 22.4 152 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 time increased the temperature decreased, the black cup decreased / lost heat faster than the silver cup. As time went on the black cup was consistently absorbing heat from the hot water inside the black cup, where as the silver cup consistently reflected the heat back into the cup. This is because the black cup loses heat quicker than the silver because lighter surface do not conduct heat as well as darker surfaces. EVALUATING My original hypothesis was correct- I think that the silver cup will retain the heat for a longer period of time than the black cup, I think this because the black cup will absorb the heat, where as the silver cup will reflect the heat back into the cup causing the black cup to cool down faster than the silver cup. By Daniel Ward ...read more.

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