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# Show the principle of 'space blanket' by comparing the rate of cooling of two beakers containing hot water, one covered in foil and the other in black paper.

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Introduction

SCIENCE COURSEWORK: Space Blanket AIM: Show the principle of 'space blanket' by comparing the rate of cooling of two beakers containing hot water, one covered in foil and the other in black paper. PLAN: Diagram... Equipment... * 2 x 250ml beakers * black paper * foil * 2 x thermometers * kettle * 2 x 200ml hot water * stop-clock Method... First of all, I will wrap up each of the beakers with either black paper or foil. Then I will pour 200ml of just off the boil hot water into each of the beakers and take a reading from each. I will start the stop clock and take a reading of the temperature after every minute. Finally, I will take the last reading after 15 minutes, and record all my results in a table. Fair Test... To make my experiment fair, I will be using the same amount of hot water in each beaker. ...read more.

Middle

67 10 66 66 11 66 64 12 64 63 13 62 62 14 62 61 15 60 59 CONCLUSION: From looking at my results and graph, you can see that although the average starting temperatures are slightly different, the temperature drop in the water in both of the beakers is actually the same, 26 oC. This does not prove my prediction is correct, which is that the foil beaker will radiate the heat back into the beaker, therefore keeping it hotter for longer and the black beaker will absorb the heat from the water and convect it into the atmosphere therefore making the water lose heat faster. This must mean that a few anomalies must have occurred, which I will look at in my evaluation. However, if you look at the results table for Experiment 2, you will see that my prediction would be correct, as in Experiment 2; the temperature of the water in the foil beaker dropped 27 oC from 90 oC to 67 oC, whereas in the black beaker the temperature dropped 29 oC, from 89 oC to 62 oC. ...read more.

Conclusion

As light shiny surfaces are good reflectors, this meant that the more matt surface was facing the water, and wouldn't have been as good as reflector of heat as the light shiny side. This could have also affected the temperature difference between the two beakers. Next time I would swap the foil around. Another reason why my experiment was not the success I hoped it would be is the time span, which I tested it over could have been too short. If I, say had tested it over a period of about 25-30 minutes maybe the difference in temperatures would be more noticeable. 15 minutes was, in my opinion too short to test how heat is lost from differently insulated beakers though radiation. I would take all of these factors into consideration if I were to perform this experiment again. Overall I think my experiment went reasonably well, but would have benefited greatly and proved that my prediction was right if I had taken the above factors into consideration. ...read more.

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