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

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Introduction

AT1 INVESTIGATION By Farah Kazi 10w TITLE: The factors effecting Insulators. . AIM: To investigate the effect of insulators on the rate of cooling. Introduction: I will be investigating the rate of cooing, 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, 1layer, 2layer 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

(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 'Bubble-wrap' Results: Result 1: Layers Begin at 2min 4min 6min 8min 10min 0 80c 75c 71c 67c 63c 61c 1 80c 78c 76c 73c 70c 68c 2 80c 78c 75c 74c 73c 71c 3 80c 79c 77c 75c 73c 72c 4 80c 79c 78c 76c 75c 74c Results 2: Layers Begin at 2min 4min 6min 8min 10min 0 80c 78c 74c 70c 67c 65c 1 80c 78c 75c 72c 70c 68c 2 80c 77c 76c 75c 74c 70c 3 80c 78c 77c 75c 73c 72c 4 80c 78c 76c 75c 74c 73c Average results: Layers Begin at 2min 4min 6min 8min 10min ...read more.

Conclusion

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. We came across some difficulties whilst conducting this experiment. Like for instance, we were supposed to take out three results and then take out an average. But because time was of an essence we could only take out the experiment twice. So, our average isn't as precise as it should be. I could improve my investigation by, like I said before conducting my experiment three times at least, so that I can take out a reliable average. Also this would help us to draw out accurate conclusions. If we had shared results with other groups this would of helped us to see if we went wrong anywhere or if they went wrong anywhere. So we could fix the problem. 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. ...read more.

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