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The aim of the investigation is to see if giving a coffee cup insulation affects how much heat is lost

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Introduction

Coursework Aim: The aim of the investigation is to see if giving a coffee cup insulation affects how much heat is lost Prediction My investigation is to see which will lost the most heat a coffee cup with cotton wool insulation or without any insulation. Heat transfer is a process in which energy in the form of heat energy is exchanged between things at different temperatures. Heat is generally transferred in three ways conduction, convection, and Radiation. This experiment involves heat escaping by all three methods here is a description of each Conduction This is where heat energy passes through the sides of the cup by making the particles vibrate and will pass on the vibrations to the next particles causing heat to pass through the sides of the cup and out into the air Convection This is where the cooler water particles sink to the bottom and the hotter particles move to the top. Convection will only affect my experiment if a lid wasn't on. This is because the warm water will float up to the top and heat will escape. ...read more.

Middle

I also think that gases are better insulators than solids because particles are further apart making it harder to pass on vibrations. Equipment The equipment I will use timer, cup, thermometer, cotton wool elastic band and kettle Safety To ensure my experiment will be safe I will keep my hands away from boiling water and will clean up any spillages Fair Test To make this a fair test I must ensure that same volume of water is used, same size cup, same temp of water. Keep a lid on both experiments Method 1. Collect all equipment that is needed as shown in the apparatus 2. Wrap the cup in cotton wool and leave on without insulation 3. Boil kettle 4. Pour 50 ml of boiling water in cup 5. Put in the thermometer and start the clock 6. Record temperature every minute for 5 minutes 7. Repeat experiment for more accuracy Results Experiment 1 with insulation Minutes Temperature Room temp 24 Min 1 95 Min 2 93 Min 3 91 Min 4 89 Min 5 86 Experiment 2 with insulation Minutes Temperature Room temp 24 Min 1 94 Min 2 92 Min 3 90 Min 4 87 Min ...read more.

Conclusion

Heat loss is reduced when there is an insulator wrapped around the cup 2.Small pockets of air is a good insulator Evaluation A big safety concern before the experiment was the temperature of the water so we made sure it didn't succeed 100c. I feel that I was precise when measuring the volume of liquid and temperature. Also I measured the temperature with a thermometer to the nearest degree and measured the time to the nearest second. I didn't take enough readings for my liking due to insufficient time. I didn't really obtain any anomalous results as they all went down in a similar pattern. To improve my experiment I could of used a clamp to keep the thermometer in place as it could be at different temperatures at different places. By doing these I would of kept my experiment much fairer. I could of also tried some other insulators in my experiment e.g. bubble wrap as this would be excellent as it has a lot of trapped air or black paper of some sort as this is a bad insulator as it would absorb the heat. I could also wrap the insulation round more than once as this would see if more insulation would mean less heat lost ...read more.

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