So­lar Cookie Oven

North & South - - Good Times -

Sci­en­tific prin­ci­ple: So­lar en­ergy Time re­quired: 1 hour

In­tro­duc­tion

Usu­ally, ovens are pow­ered us­ing elec­tric­ity or gas. This ex­per­i­ment uses the sun’s own nat­u­ral en­ergy – or so­lar power – to heat an oven that bakes cook­ies.

Equip­ment

• Pizza box (or ce­real box)

• Pen­cil

• Ruler

• Util­ity knife

• Alu­minium foil

• Plas­tic wrap

• Sticky tape (or glue)

• Black pa­per

In­gre­di­ents

• Warm, sunny day!

• Cookie dough: 15g (1 Tbsp) but­ter, 30g (2 Tbsp) sugar, 25g (4 Tbsp) plain flour, 5ml (1 tsp) milk

In­struc­tions

1. Use a pen­cil and ruler to mark 2.5cm (1 inch) in from each side on the pizza box lid and draw a square to con­nect the marks. 2. Cut along the front and side lines of the square with the util­ity knife. Fold along the back line so it acts as a hinge. 3. Line the inside of the flap and the inside walls of the box with foil, and tape or glue in place. 4. Seal the cut- out win­dow shape by tap­ing a sheet of plas­tic wrap over the hole. 5. Glue or tape a sheet of black pa­per to the bot­tom of the inside of the box. 6. Mix the cookie dough in­gre­di­ents and roll into small balls. 7. Ar­range the balls of dough on a sheet of foil and place on top of the black pa­per inside the box. 8. Prop the cut- out lid at a 90° an­gle us­ing a pen­cil and some tape. Leave out­side fac­ing the sun un­til the cookie balls flat­ten out (any­thing from 15 to 60 min­utes). 9. Care­fully re­move cook­ies from the box and al­low to cool – then eat!

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