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Lagging Pipes.

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COURSEWORK ASSESSMENT - ALL SKILLS - Sc4 Lagging Pipes Planning Purpose During the colder months of the year, the water in unprotected water pipes can freeze. As it does this it expands causing the pipe to split. I have been asked to investigate how different numbers of layers of an insulating material can affect this process using boiling tubes as a model. Diagram Method This experiment is to investigate how the thickness of the insulation affects the rate of cooling of the water in the pipe. I will set up the apparatus as above with 1 layer of the bubble wrap that covers most of the boiling tubes fastened with elastic bands to hold it in place. I will set up four more sets of apparatus as the above diagram. Each with an extra layer of bubble wrap up to a maximum of 5 layers. I will then fill the boiling tubes 40ml full of boiling water. I will place the rubber bungs into the tops of the boiling tubes fitted with the thermometers, wait until they settle and take the temperatures. ...read more.


4 mins. 6 mins. 8 mins. 10 mins. 1 0 3 6 9 11 13 2 0 2 4 6 8 10 3 0 2 5 7 9 11 4 0 1 3 4 6 7 5 0 2 4 6 8 9 Graph (On attached sheet) Analysing and Considering Evidence The evidence and results that I have collected show that the thicker layers of bubble wrap do in fact insulate the water much better than the thinner layers. In my first table, I have simply entered the temperatures that I read off each thermometer at the appropriate time. I have done this to show my original evidence and to also compare with the second table and graph. The second table shows the differences from the start results for each boiling tube, which is the total amount of heat lost during the ten-minute period. I drew this table to make the comparisons on the graph easier. I plotted these results onto the attached graph. Here is my analysis of these results. ...read more.


The bubble wrap I used was not of the best quality and was quite worn. If a lot of the bubbles had been popped, then the heat could convect through it much more easily. My conclusion does not support my prediction because I think to get more accurate results I would need to re-do the experiment to check that my collected results were similar. Evaluation I think that the method that I used for this experiment was a valid one. I t enabled me to collect the information that I needed to draw up my conclusion. The evidence that I obtained could have probably been a bit more accurate. I could have improved my method by using thermometers of the entire same brand. That way even if the temperature displayed is inaccurate, they should all be the same. Also I could have used newer, better quality bubble wrap to make sure that popped bubbles didn't affect my results. I could have improved the accuracy by using electronic thermometers. To be absolutely sure of my results, I would need to almost definitely do the experiment for a second and maybe even third time to check that the results are constant and not as anomalous as the ones I have collected here. ...read more.

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