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The Rate of Heat Loss

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Introduction

Nicole Ryan The Rate of Heat Loss Introduction My investigation is to find out the main method at which a liquid cools. When a liquid cools down, it loses heat in four ways: * Conduction * Convection * Evaporation * Radiation Aim MY aim is to investigate which method of heat loss is mainly responsible for a cooling a liquid down by changing the main method of heat loss and measuring the cooling rate. Prediction Heat is generally transferred by conduction, convection, evaporation and radiation. All these processes can all happen simultaneously, but it is likely that one will give the greater heat exchange. Below is a description of the processes that will affect my experiment. Conduction This is where heat energy passes through the walls of the can by making the particles of the can vibrate and then they will make the particles next to them vibrate causing the heat to pass through the walls of the can and out to the surroundings. Materials that are good thermal conductors tend to be good electrical conductors; metals such as gold, silver and copper have high thermal conductivity's and will conduct heat readily. ...read more.

Middle

If I use a lid this could slow down this process. As the water vapour will not be able to escape into the air as quickly as it would normally keeping the heat in for longer. Factors There are many factors, which can affect my experiment. They are: 1. If a lid is used There will be a great difference in the speed of heat loss if I use a lid. This is because a large amount of heat will escape from the top of the can by convection and evaporation. Therefore if I use a lid it will slow down these processes. 2. Volume of water used When the volume of water is higher, it will stay warmer for longer than if there was a low volume of water. This is because when there is a high volume of water then the outside of the water will cool down, but the inside will stay warm. 3. If the can is insulated If the can that the water is in is insulated then it will stay warmer then if the can is not insulated. ...read more.

Conclusion

1st Attempt (Degrees Celsius) 2nd Attempt (Degrees Celsius) Average (Degrees Celsius) 2 80 81 80.5 4 78 78 78 6 76 77 76.5 8 75 76 75.5 10 74 75 74.5 12 73 74 73.5 14 72 73 72.5 16 71 72 71.5 18 70 71 70.5 20 69 70 69.5 Starting Temp: 83 Conduction TIME (Minutes) 1st Attempt (Degrees Celsius) 2nd Attempt (Degrees Celsius) Average (Degrees Celsius) 2 66 62 64.5 4 63 60 61 6 60 58 59 8 58 56 57 10 56 54 55 12 54 53 53.5 14 52 51 51.5 16 50 50 50 18 48 48 48 20 47 46 46.5 Starting Temp : 67 Convection TIME (Minutes) 1st Attempt (Degrees Celsius) 2nd Attempt (Degrees Celsius) Average (Degrees Celsius) 2 69 70 69.5 4 65 68 66.5 6 61 65 63 8 58 63 60.5 10 56 60 58 12 54 59 56.5 14 52 56 53.5 16 49 52 50.5 18 48 48 48 20 45 46 45.5 Starting Temp: 73 Conclusion From looking at the graph and results table I conclude that convection is the main method at which a liquid cools. ?? ?? ?? ?? ...read more.

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