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What affects the rate of heat transfer through an Aluminium can?

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Introduction

Science GCSE Coursework What affects the rate of heat transfer through an Aluminium can? There are three main factors of heat transfer (heat loss). These are: > Conduction- of heat mainly happens in solids i.e. metals. Conduction of heat is the process where vibrating particles pass on their extra vibrations of energy to neighbouring particles. Heat is carried through the metal by freely moving electrons; they diffuse from the hotter region to the colder region through the metal. Making all metals bad insulators but a good conductor of electricity (good conductors of heat are good conductors of electricity) because of the motion of free electrons. Conduction will take place in this experiment because there is a metal can used to reduce this I will use different types of materials. > Convection- of heat occurs only in liquids and gases. Gases and liquids are usually free to move (much more than a solid) and that allows them to transfer heat by convection which is much more process than conduction (convection simply can't happen I solids because particles can't move). Convection happens when energetic particles move from the hotter region to the colder region- and take their heat energy with them. When the more energetic particles (hotter particles) get somewhere colder they then transfer their energy by their usual process of collisions, which warms up the surroundings. ...read more.

Middle

Follow steps 2-7. 9. Done first experiment. 10. Follow steps 1-8 but use different paired material, which is going to be foil and white lid. 11. Done second experiment. 12. Follow steps 1-8 but use different paired material, which is going to be black lid and cardboard. 13. Done third experiment. Whilst carrying out the experiment all safety regulations of the laboratory apply Fair Test To ensure the experiment is carried out fairly the following factors will be considered: o The temperature of the water will always be 500c when starting the experiment. o Always measure the water to 50ml when starting experiment. o Make sure record time after every minute in total six readings. o Make sure each test is done three times and done at the same time so that there is not any difference in amount of material. o Make sure same amount of material is used in each experiment. o All tests will be done at room temperature. Safe Test To ensure that the experiment is safely carried out the following factors will be considered: o Care will be taken when pouring water into measuring cylinder and metal can because it causes the skin to burn. o The experiment will be done in the middle of the table because if it is done near the end it could fall. ...read more.

Conclusion

More or less, fit into a pattern and the line of best fit on the graph runs through nearly all the points. To make my results more reliable I could repeat the experiment more times. As the more times you repeat the experiment the more reliable they are. I could always measure accurately the amount of water, which I acquire. I could always set the water at the same temperature every time by a mechanism, which pours the water as soon as the water reaches the certain temperature. The last improvement that I would make is to clearly read the thermometer or else use a digital thermometer. These improvements will make the evidence more accurate and more reliable. The evidence is sufficient to support a firm conclusion. I have plenty of evidence to support the conclusion and the evidence is mostly accurate. I can tell the evidence is generally accurate because the line of best fit on the graph runs through most pf the points. To extend this investigation I could use a plastic and investigate how plastic affects the heat loss. I could investigate how increasing the temperature of the water affects the heat loss. I could investigate how additional water affects the heat loss. Also I could investigate a wider range of materials affects the heat loss. These extra investigations would give me a much better conclusion, which had a lot more evidence to support it and that covered more factors that affect heat loss from a container. By Habibur Rahman 10B-1 (08-06-2003) ...read more.

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