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# Heat Loss in Coffee.

Extracts from this document...

Introduction

## Prediction

I predict that the best way to keep coffee warm is to have a silver insulator because of what we know on radiation and silver being a poor emitter compared to a plain beaker or a black one. I predicted this because most saucepans are silver because silver is a poor emitter compared to white and black and also silver is shiny which cuts down heat wasted by radiation.

## Research

After making a cup of coffee it loses heat because of the following factor:

· Evaporation

· Conduction

· Convection

The sun radiates heat through empty space in the form of tiny waves. If you absorb any of the Sun's radiation, it heats you up. This is why it is sometimes called Heat radiation. Everything gives off some heat radiation. The hotter it is the more it radiates. A black area absorbs much more radiation than a white surface.

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## Result table for dye

 Minutes Yellow Dye1 BlackDye1 YellowDye2 BlackDye2 0 82 85 75 74 1 77 74 68 64 2 74 71 67 63 3 71 68 65 61 4 69 66 64 60 5 67 64 62 59 6 66 62 61 57 7 64 60 59 55 8 63 59 57.5 54 9 62 57 56 52 10 60 56 55 52

The starting temperatures are starting at different temperatures, which make the graph unfair. So I need to work out the temperature

Conclusion

## Evaluation

I think that during this experiment we use our apparatus accurately by having the same size beaker and measuring cylinder. I think that our experiment wasn't extremely accurate because of the cooling down at the start. This caused different starting temperature but because the table and graph recorded the change it didn't affect too much.

In my graph it shows that Silver is the best followed by black and plain last. On the other further experiment it showed that yellow dye was better than black dye. I thought that my experiment went well but that human error must have been caused because it was difficult at one time because of measuring and recording all of them at the same time this showed in my plain line where the circled point didn't fit in.

This student written piece of work is one of many that can be found in our GCSE Radioactivity section.

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