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Investigation to find the best material to cover a newborn sheep to reduce the heat loss and keep it warm

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Introduction

James Murray 10-3 23rd April 2001 Investigation to find the best material to cover a newborn sheep to reduce the heat loss and keep it warm Aim The purpose of this experiment is to determine the best material to cover a new-born lamb. Many different materials will be used and by the end of this experiment we shall have determined the best heat insulating material for this application. Apparatus Thermometer Kettle Test tube rack Stopwatch Measuring cylinder Elastic bands Test materials: Cotton wool Bubble wrap Cotton Paper towel Foil Diagrams Previous experiment I initially conducted this experiment but with only two of the materials so I have an idea of what will happen and the experiment can also help me plan for this one. I covered two test tubes in 12cm by 12cm material (one in cotton wool, one in bubble wrap) and added 10ml of boiling water. I waited until the temperature of the water reached 60? Celsius and then began reading the temperature for 10 minutes. I then made a table of my results, which is shown below. Time (m) Bubble wrap (?C) Cotton wool (?C) 1 54 54 2 52 53 3 51 51 4 49 50 5 48 49 6 47 49 7 45 47 8 44 45 9 43 45 10 41 44 After completing this experiment I have decided to change a few things and add others to get a better and wider range of results. I used a wider range of materials and tested them three times each for consistency as well as leaving them for 20 minutes instead of 10 minutes as it gave a better view of the speed of the heat loss. ...read more.

Middle

With 3 sets of results it is easy to see if something is wrong as you can easily compare the data. Results Time (m) Bubble Wrap (?C) Bubble Wrap (?C) Bubble Wrap (?C) Average (?C) Control (?C) Control (?C) Control (?C) Average (?C) 1 54 54 54 54 55 55 57 55.6 2 51 49 51 51 51 50 50 50.3 3 49 47 50 49.5 48 48 48 48 4 48 43 48 48 46 46 47 46.3 5 46 40 46 46 46 46 45 45.6 6 45 40 45 45 45 45 44 44.6 7 44 39 45 44.5 41 41 41 41 8 44 38 43 43.5 39 39 39 39 9 43 37 42 42.5 38 38 38 38 10 41 36 41 41 37 38 37 37.3 11 40 35 40 40 36 35 36 35.6 12 39 35 39 39 34 34 34 34 13 39 34 39 39 34 33 34 33.6 14 38 34 38 38 33 33 33 33 15 38 33 37 37.5 33 32 33 32.6 16 36 31 36 36 31 31 32 31.3 17 35 31 35 35 30 30 31 30.3 18 35 30 35 35 29 28 30 29 19 34 30 33 33.5 29 28 29 28.6 20 34 29 33 33.5 27 26 28 27 Heat Lost (?C) 20 25 21 20.5 28 29 29 28.6 (Incorrect results not used - test tube not properly covered) ...read more.

Conclusion

I could extend this experiment by using more materials such as leather, feathers, silk etc or I could also investigate using different layers of each material as well. This would enable me to determine the better heat insulator and find how much heat is lost through whichever material with any number of layers around the outside of the test tube. Alternatively we could use a specific weight of material rather than size. I could also leave the experiment for a bit longer to see a better pattern emerging. It might be good to leave it for any time between 30-60 minutes. Conclusion In conclusion my results show that cotton wool is the best heat insulator out of itself, bubble wrap, foil, cotton and paper towel. It only lost an average of 16.3?C over the 20 minutes and that was almost a full 3?C less than second best, which was the foil. The control test tube (naked) lost the most heat as it was left uncovered and the worst material was the paper towel but it held in on average 6?C more than the control test tube. These results are almost exactly as I predicted but the average amount of heat lost by each material is a lot closer to other materials than I expected. I have shown the averages below. Cotton wool average lost - 16.3?C Foil average lost - 19?C Bubble wrap average lost - 20.5?C Cotton average lost - 20.6?C Paper towel average lost - 22.6?C Control average lost - 28.6?C ...read more.

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