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In this investigation I will investigate heat loss and heat transfer in different materials and I will also investigate which materials are the best insulators.

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Introduction

Science Heat Loss Investigation Da don Ranjit dhillon'z coursework, Introduction In this investigation I will investigate heat loss and heat transfer in different materials and I will also investigate which materials are the best insulators. A material that prevents this heat loss is called an insulator and this helps to keep the object that is being insulated warmer for, longer. Heat is generally transferred in three different methods: - - Conduction - Convection - Radiation Conduction is energy transferred from the hotter part of a solid to the colder part of conduction. It is transferred by the particles in the material the particles in the hot part are vibrating more. These vibrations are passed on to the cooler particles next to them, so the energy spreads through the material until all particles have the same energy. Metals are good conductors, whereas most non-metals are poor conductors and poor conductors are used as insulators. Convection is the transfer of energy by the movement of a liquid or gas. When a liquid becomes warm it expands and becomes less dense. The warmer fluid floats above the cooler fluid, which sinks. This creates a flow, which is called convection current. Radiation is when bodies emit radiation. Basically the hotter the body, the more energy it radiates. Dark, dull surfaces emit more radiation than light, shiny surfaces. They also absorb radiation well. Light, shiny surfaces do not absorb radiation well - they are good reflectors. ...read more.

Middle

I will: o Wear Safety goggles to protect my eyes o Be careful when pouring the water out of the kettle o Also I will use a cloth to handle the measuring cylinder, as it will be considerably hot. Prediction I think that as the experiment goes on the rate of heat loss will slowly decrease so there will not be as big difference during the first few readings then toward the end. Out of the two materials I chose to investigate I think that the tin foil will be the better insulator. We already know that shiny surfaces do not absorb radiation well reflecting heat back into the beaker, therefore will make the water warmer for longer. I think that the black paper will a poor insulator and will not keep the heat in the beaker because the colour black absorbs heat and transfers it away so I think black card will not be a good insulator. Also I think that the more amount of water I use in this experiment the more it will be insulated, and therefore stay warmer for longer. As we know already this as the outside of the water will cool down and the inside will stay warm. Apparatus o Thermometer o 150 ml beaker o 100 ml beaker o Silver foil o Black paper o Kettle o Sellotape o Scissors o Safety goggles o Stop clock o 250ml measuring Cylinder o Black paper o Tin foil o Cloth Diagram Method o I will first of all put ...read more.

Conclusion

I think that the investigation went good as I kept the test fair and achieved my aim of getting good results and these results proved my prediction. Also I received a few anomalous results there could have been many reasons for this. I could have read the temperature at a wrong time or the room temperature suddenly changed. I could have improved my experiment by doing it in controlled conditions and I was doing the experiment near a window, and this could have affected the results as it could have made it warmer or cooler. The method I chose to use was successful and worked well within the investigation it was stable and fair. I would not change the method if I repeated the investigation as it worked well with the experiment. Also to improve my investigation I could have done many things. I could have repeated the experiment again and took down the average results and this will make the experiment more accurate as one set of my results could have been affected. Also there would have been different temperatures within the beaker thought they would have only been slight differences. The temperature would be different with the water nearer to the glass compared to the water directly in the middle. So it would have helped if I stirred the water so I could get the general temperature. ENJOY THIS PIECE OF COURSEWORK, I COMPOSED THIS OUT OF MANY OTHER COURSEWORKS AND THIS IS "A" QUALITY, AND HELPED TO ACHIEVE MY DOUBLE "A" IN GCSE!! BO! Ranjit Dhillon GCSE COURSEWORK ...read more.

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