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# Investigate the relationship between temperature and evaporation rate.

Extracts from this document...

Introduction

Dang Thuy Dung

13 Physics Report SL

## Evaporation experiment

Investigate the relationship between temperature and evaporation rate

The hypothesis for this experiment that the higher the temperature the faster the evaporation rate. I assume this prediction based on the background theory of moving particle. It states that a substance at a particular temperature has a range of kinetic energies. The higher the temperature, the faster the energetic particles vibrate and overcome the attractive forces of neighbouring particles, thus escape from the liquid as a vapour[1].

Design:

The independent variable in this experiment is the different type of liquid (boiling water at 70° and cool water at 28°

The dependent variables in this experiment are the time for the experiment and the temperature changed

The controlled variable in this experiment is the dryer

Apparatus:

1. Set up the experiment with 75ml of liquid in a beaker, a dryer, a stop-watch and a thermometer
1. Use the thermometer to check the initial temperature of the 75ml liquid
1. Heat the liquid by using the hair-dryer. Dry the liquid for two minutes, then immediately measure the temperature by using the thermometer. Record data in table
1. Repeat step 3 for another 2 minutes for another 2 times

Middle

28.0

31.0

31.5

32.0

Boiling water

70.0

58.0

53.0

46.0

Test 2:

 Type of liquid Initial temperatureof liquid (°C) Temperatureof liquid after being dried (°C) ± 0.1 2 minutes±0.1 4 minutes±0.1 6 minutes±0.1 Cool water 28.0 30.0 32.0 32.0 Boiling water 70.0 61.0 54.5 50.0

The results support my hypothesis which is the higher the temperature, the more temperature will be lost when heated (dried), results in an overall drop in temperature in the boiling liquid. As for the cool liquid, the temperature is gained as heated (this is not stated above at the hypothesis) but has shown a very contrasting pattern (will be further discussed in the conclusion section).

The below graphs indicate the rate of change during the six minutes for the two tests for both cool and boiling liquids (water).

The graph indicates the boiling effect (drying – heating) on boiling liquid. For both tests, the temperatures for the liquid go down. At the first two minutes, it is notified that the temperature falls most severely. The explanation is that the molecules with kinetic

Conclusion

Limitation:

Time constraint is a major factor that prevented me from repeating the experiment more time. If I were to have more time, I would surely repeat this experiment to ensure a stronger set of data result evidence.

Realistic Improvement:

- It is important that one looks at as many and different aspects of the experiment as possible. Next time, I shall plan, design carefully for 1-2 hours and decided on which aspects would most likely to influence the variable

- To enhance the range of results, it is important that I should repeat the experiments many times and average the result.

[1] Kerr.G.Ruth.P.,. International Baccalaureate Physics. IBID Press, Victoria:2007.page 90

[2] Kerr.G.Ruth.P.,. International Baccalaureate Physics. IBID Press, Victoria:2007.page 90

[3] Kerr.G.Ruth.P.,. International Baccalaureate Physics. IBID Press, Victoria:2007.page 90

[4] Kerr.G.Ruth.P.,. International Baccalaureate Physics. IBID Press, Victoria:2007.page 90

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