++Save money ﹏ the material we used were recycled one. ++Convenient ﹏ we do not need to look

after it when heating the water.

++ Protect the environment ﹏ the solar cooker use solar energy

which is renewable energy. It reduces the need to use coal, petroleum gas .. etc which are non-renewable energy. In so doing can reduce the amount of pollutants. ++Creative ﹏ the solar cooker is made from

the ideas of the whole group.

。A paper box。A paper which is black in colour 。Aluminium foil。Cling wrap。Cotton。An aluminium can

→We used a box and painted it black. →Inside the box, we glued aluminium foil onto it.→We made two cards for reflecting light on two sides of the box.→We put the can in the middle of the box and use a convex lens to focus light onto it. →And then we cover the box with cling wrap.

∠Black surface can absorb energy more efficiently. ∠Silvery surface inside the box can

reflect energy onto the can.∠Cotton was wrapped around the can to

reduce the energy loss.∠The cling wrap can have greenhouse

effect to decrease the energy loss.

∠Convex lens is used to focus the energy onto the can.

The first test:Original temperature~20oC1st~21oC

2nd~22oC

3rd~22.5oC4th~23oCoC5th~23.5oC6th~24oC7th~25oC8th~26oC9th~26.5oC

The second test:Original temperature~22o

C1st~23oC2nd~25oC3rd~27oC4th~30oC5th~30.5oC6th~31oC7th~32oC

∞We have leant how to apply the knowledge we had leant before and

apply these to our daily lives.∞We learned the principle of keeping thing warm.∞We learned how to use our renewable energy-solar energy.∞If the society makes use of solar energy, it can help reduce a lot of pollutants.

↑We should use more reflecting surfaces to reflect energy onto the can↑We should put the can higher in the box.↑We should use a bigger paper box.↑The aluminium foil should be straight so as to cause regular reflection.

╭☆Ching Man Ka (7) ╭☆ Ho Pui Ki (10) ╭☆ Lee Cheuk Man (13) ╭☆ Yau Yuen Ching (17) ╭☆ Yeung Ka Hei (18)

Paper in Black $1Paper box freeAluminium foil $12.3Cling wrap $15.4Cotton freeConvex lens freeCan free