1. 4E(2004-2005) Chan man Hang(2) Chow Chui Shan(5) Lam Yuen Ching(10) Ma King Man(13) Yeung Po Yee(16)

2. Magnifying glass mirror wool mirror wrap Inner Silvery surface Aluminium Foil Can ( Black Surface)

3. - Aluminium Can - Aluminium Foil - Cardboard - Knitting Wool - Cling Wrap - Mirror - Magnifying glass - Black Paper - Wire

5. -the inner surface of the solar cooker is covered by aluminium foil to reflect and focus the sunlight onto the can of water -using lots of mirrors to reflect and focus the sunlight onto the can of water

6. -the can is painted black in color dull black surface is a good absorber of heat

7. - Using wools to cover the outer part of the solar cooker Wools are poor conductor of heat and thus can prevent loss of heat by conduction

8. -Using wrap to cover the upper part of the solar cooker trap the heat inside the solar cooker

9. -Using magnifying glasses to focus the sunlight onto the can of water the sunlight will be more concentrated so as to heat up the can of water more easily

10. -When the weather is cloudy, we use our woolen jacket to surround the solar cooker. to prevent the heat loss by conduction - When the weather is fine, we use a lot of mirrors to focus the sunlight onto the water.

12. Time (min) 051015202530354045505560 Temp ( ℃ ) 29303132343536373839

13. Variation of the temperature of water in the solar cooker Temperature(C) Time(min)

14. 051015202530354045505560 Temp ( ℃ ) 27313436404347505255576063

15. Variation of the temperature of water in the solar cooker Temperature©

16. The water can be heated up when it is put in a solar cooker under sunlight. The physics principles applied in solar cooker is – Radiation, Conduction, Reflection and Greenhouse Effect.