1. Solar Cooker Report” *Group 4

2. >Draft: Solar Cooker aluminium foil Plastic sheet Box Base Space Container

3. Solar Cooker >Materials used: 1.Aluminium Foils 2.Plastic Sheet 3.Aluminium Can 4.Black cloth 5.Cardboard Box The Modal Of Solar Cooker

4. Solar Cooker >Principle: 1.Using the theorem of heat, we painted the box in black colour because objects with a black, dull surface is a good absorber. 2.Secondly,we make some space between the base and the box to let air go inside. Due to air is a good insulator of heat, it can helps us to trap the heat energy. 3.Thirdly,we glue several aluminium foil inside the box. Its silvery colour can reflect the radiation in order to trap the heat inside the box. 4.Then, we painted the base of the box in black colour to absorb heat and help to boil the water. 5.Next,we covered the container by a black cloth. The purpose is same to (4). 6.Eventually,we covered the entranceway of the box by a plastic sheet. It act as a glass to make greenhouse effect.

5. Experiment Minute 051015202530 Temperature 26.5272829303233 Minute 354045505560 Temperature 33.53434.53535.535 >Data Presentation:

6. Experiment Result: In the experiment, our solar cooker rose 9 degree Celsius from 26.5 to 35 degree Celsius in 60 minutes. That’s a good news! And we did the experiment successfully. Discussion: We discovered that the smaller box is better than the big one. It is because the container can absorbs the heat easier. Put a plastic sheet on the container and the entranceway of the box to make a double green house effect may traps more heat.

7. Conclusion 1.The experiment proved that heat is absorbed easily by objects with black surface. 2.In green house effect, It also told us that air is a good insulator to trap the heat energy.

8. Members 4C class Group leader: Chan Sheung Yee(3) Cheung Sze Man(5) Hui Yan Yi (7) Li Yuen Ting(13) Lee Wing Shing(34)