Solar+Pizza+Box+Oven

== || || 1. Open up the pizza box. Paint the outside black. Black absorbs light energy, which then turns into heat. || 2. Cut a 3-sided flap on the inside of the box lid.. || 3. Paint the outside edge of the flap black. Tightly stretch and tape cling wrap or a piece of oven bag across the hole to make a window. ||
 * =Cooking with Sunshine...=
 * [[image:P1250367.JPG]] || [[image:youwillneed.gif width="198" height="51"]]
 * A large pizza box
 * PVA glue or duck tape
 * Black acrylic paint
 * Cling wrap or an oven bag
 * Aluminium foil
 * Newspaper ||
 * [[image:P1250368.JPG]]
 * [[image:P1250375.JPG]]

4. Finish taping the window Sunlight enters the box through this window. || 5. Make the solar reflector. Fold back the flap. Tape on a piece of aluminium foil - shiny side out, no wrinkles.Wrinkles cause the sunlight to 6. Fold up the box. Line the bottom with foil - shiny side facing out. Tape it in place. || 7. Paint the foil black. It may need 2 coats. || 8. Roll a sheet of newspaper into a tube. Leave a hollow down the middle. This traps air. Air traps heat. Cover the tubes in foil. || 9. Cut the newspaper tubes to fit around the inside edge of the box. Close the lid. || 10. Point your open box towards the sun. You will see the sunlight reflected inside the box. Prop the lid in place with a stick. || =Congratulations! You are now ready to cook using only the power of the sun!= Tape them around the edges of the window so you don't have to keep moving the box aroundto face the sun.
 * [[image:P1250378.JPG]]
 * reflect** at funny angles. You want the sunlight to bounce
 * INTO** the box. || [[image:P1250382.JPG width="310" height="233"]]
 * [[image:P1250384.JPG]]
 * [[image:P1250388.JPG]]
 * Hint! ** Use a glass dish or black oven tray to cook solids and a zip-lock bag to cook liquids.
 * [[image:handy-tip.jpg width="208" height="198"]]
 * Make 3 more solar reflectors out of cardboard**.

newspaper between them to trap air for more insulation. || Try **a mirror** as a reflector instead of aluminium foil Use a piece of picture frame **glass** instead of cling wrap ||
 * Pack your box inside another box** using scrunched

=How does it work?=
 * [[image:pizza_box_oven_sm.gif width="200" height="248" align="center"]]

The solar oven is an example of **//passive solar heating.//** Passive solar heating uses the energy of the sun to heat things up directly. || **Rays of sunlight** are coming to the earth at an angle. The foil reflects the ray, and bounces it directly into the opening of the box.

Once it has gone through the cling wrap, it heats up the air that is trapped inside.

The black paper absorbs the light then has to get rid of all the light energy it absorbed, which it does by heating up.

The rolled newspaper makes sure that the heat stays where it is, instead of escaping out of the sides of the oven. ||