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# What is the best way to keep hot water hot for the longest period of time

Extracts from this document...

Introduction

How can we keep hot water hot?

Introduction

In this practical experiment, I am going to find out what is the best way to keep hot water hot for the longest period of time.  The way that this can be achieved is by preventing, Radiation, Convection and Conduction.

Planning

I am going to apply my background knowledge to the experiment so that it is easier to choose which items I am going to use in the experiment.  Here is my background knowledge.

Background knowledge

I already know that heat can be lost by conduction, convection and radiation.  Therefore it would be in great interest to look into these in depth as then I can see how I can prevent these from occurring.  The first way I am going to cover is conduction

Conduction-

Conduction is what occurs in many solids.  The way it is mainly passed is through the solids’ vibrations.  This is how the solid will look as the vibrations are passed through it.

Most non-metals are not good conductors and are good insulators as they do not vibrate as much so therefore the process of conduction is very slow.

Convection-

Middle

69

1.30

81

7.00

68

2.00

80

7.30

66

2.30

79

8.00

65

3.00

77

8.30

64

3.30

75

9.00

64

4.00

74

9.30

63

4.30

73

10.00

61

5.00

71

-

-

Here is a line graph with the line of best fit for the above results.

After having done the preliminary work I am going to only do each experiment for 5 minutes as by the time it reaches to 5 minutes there is already a basic pattern there.  This change will be the only one for the real experiment.

Plan for real experiments

After having done the preliminary work, I will know write up a plan for the real experiments.

1. boil kettle
2. wrap beaker in an item
3. wait for temperature to reduce to 85˚C
4. take temp every 30 seconds for 5 minutes
5. record results
6. reheat water and repeat steps 1-5 again.

Results

Nothing wrapped around beaker

 Time (mins) Temp (˚C) 0.00 85 0.30 84 1.00 83 1.30 81 2.00 80 2.30 79 3.00 77 3.30 75 4.00 74 4.30 73 5.00 71

Cotton with

Conclusion

shiny surface.

My prediction was correct as I wrote that the combination of the three would be very effective as it prevented the loss of heat through conduction, convection and radiation.

Evaluation

I believe that the experiment that I did was a good one as it proved the prediction was right.  The method which I used meant I could get good results, as I improved it after finding any flaws with it after the preliminary work.  The results which were collected were results that I would have expected apart from the cotton with glove as this proved it was quite good at preventing the loss of heat.  I believe that it was very good as it had the glove which prevented convection from occurring.

The method was suitable for the investigation as it was corrected after having done the preliminary method.  If I had more time I would have tested other materials such as wood, cloths and other household materials.

By Jasjit Punni

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

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## Here's what a star student thought of this essay

4 star(s)

### Response to the question

A good experiment. To improve the candidate should indicate flaws and possible improvements in the evaluation of the experiment, or state what they changed after doing the preliminary experiment and why as this shows a deeper understanding of the experiment. ...

### Response to the question

A good experiment. To improve the candidate should indicate flaws and possible improvements in the evaluation of the experiment, or state what they changed after doing the preliminary experiment and why as this shows a deeper understanding of the experiment. The candidate responds to the question well, setting out a well thought out experiment that worked well.

### Level of analysis

The introduction is concise and sets out well what the candidate is trying to achieve. The candidate uses background knowledge to their experiment which is well explained with a definition of each and examples of materials the candidate could use. This is aided well by diagrams. I'm not sure what the radiation diagram is meant to depict. The prediction is outlined and explained well. The candidate uses a preliminary experiment which is good to show as a baseline what will happen without the introduction of materials to prevent the three processes. The candidate assumes 5 minutes is the cut off point for the experiment but this may not be the instance when considering the materials as well. The candidate explains their results well in the evaluation relating what happened to scientific terminology.

### Quality of writing

The candidate in the introduction capitalises radiation etc unnecessarily. Minor grammatical errors in places e.g. using then rather than than. The candidate needs capital letters and full stops in their second method. The presentation of the results is good with clear tables and graphs used to predict trends.

Reviewed by skatealexia 15/07/2012

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