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To investigate the effect of insulators on the rate of cooling.

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Introduction

Nadeeem K AIM: To investigate the effect of insulators on the rate of cooling. Introduction: I will be investigating the rate of cooling, by using various numbers of layers of insulators round a beaker of hot water. The science which effect my investigation are as follows: Conduction is a transfer of heat energy through a substance from the hotter region to the cooler region without any movement of the substance itself. As the substance is heated, free electrons spread through the substance bumping into other electrons and passing on Kinetic energy. Gradually energy is transferred along the substance. Radiation is the transfer of heat energy through waves. Hot objects emit mainly infrared radiation which can pass through a vacuum i.e. No medium is needed for its transfer. How much radiation is given out or taken in by an object depends on its surface In this experiment I could have many variables. Ranging from colour to size. They are: - The material of my cup (ceramic, metal, glass, polythene, plastic) - The layers of insulators (no layers, layer, layer etc) [this is what I have chosen to use as my variable] - Different types of insulators (wool, bubble wrap, foam, cotton, paper) ...read more.

Middle

- When pouring the water out into the basin after conducting the experiment the beaker will be extremely hot! (Near boiling point) So if I handle it by hand then I could burn myself, or I could drop the water causing the water to either spill onto someone, or it could spill onto the floor and someone could easily trip over it and hurt themselves. Variable & Fair test: There will only be ONE thing that will change throughout the entire experiment. This will be the amount of layers around the beaker. I have to make sure nothing changes except my variable. So everything else has to be kept the same to make this a fair test. The things I will have to keep the same are: - The amount of water used - The temperature of water - The insulator material must always be 'polystyrene' Results: No of layer Start temp Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min Temp after every 1 min 1 87 84 82 80 78 74 73 72 72 70 69 2 86 80 82 82 86 78 ...read more.

Conclusion

I can tell this from my graph by looking at the bar chart, where it is much clearer to see the difference in temperature every one minutes. If you look closely at the line graph you will notice that at one minutes the temperature of the 'one layer' was slightly above the beaker with' two layers'. This cannot be right because the beaker with 1 layer should drop down in temperature quicker then the beaker with 2 layers. Because the beaker with 2 layers has more insulation around it. This could be because we didn't take down the results properly or my average wasn't right. I tried to make my results accurate by making sure everything that I do was a fair test. I could improve my investigation by, like I said before conducting my experiment more than once, so that I can take out a reliable average. Also this would help us to draw out accurate conclusions. My method was good. It was quick, simple and easy to follow by. Especially once we got use to how to do it. I think that my conclusion is very accurate. I drew my conclusion out of previous knowledge, textbooks, class notes and by doing this investigation. I had enough evidence to help draw up this conclusion. To help get even more evidence for my conclusion I could do another type of investigation similar to this. By Nadeem Kazi Nadeeem K ...read more.

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