The Sci Guys: Science at Home – SE3 – EP 14: Pizza Box Solar Oven S’mores

Today on Sci Guys, solar oven s’mores. Welcome to Sci Guys I’m Ryan and I’m Theresa and today we’re making solar oven s’mores. I can’t wait to eat some s’mores but there’s something different about this kitchen and I can’t put my finger on it. Radiant Heat is the transfer of heat energy through electromagnetic waves as opposed to through conduction or convection. The equipment and ingredients your going to need for this episode includes A deep cardboard pizza box, aluminium foil, plastic wrap, tape, a piece of dowel or ruler to hold open your oven, scissors and a box cutter, a ruler and a pen and stuff to make s’mores The safety equipment for this experiment includes thermal gloves in case the inside of the oven gets very warm as well as an apron or lab coat to protect from spills or splashes. Also our younger viewers should use adult assistance when using the box cutter The first step in our experiment is to measure out the opening that we’re gonna cut in the roof of our box measure out with your pen and ruler an
inch and a half from all four sides of your box then connect all your measured out points together to make a square with your box cutter cut along the left and right edges of your box and the front edge but leave the back edge uncut cause this will
be the flap that holds the reflective surface to our oven Next we’re going to line the interior of the box with aluminium foil you want to make sure that the shiny side is facing into the box Once your finished the inside should look like this. Now we’re going to cover the opening in our oven with saran wrap you gonna want to stretch it tight and seal it with tape so that no air can escape you
may want to put a couple layers of saran wrap on to make sure that the heat is captured within the oven Once you have your saran rap on your oven should look something like this With your oven ready we’re ready to go outside Now that we’re outside you’re going to take your s’more and put it into the solar oven and then you’re going to close the lid and prop open the top with dowels depending on the temperature, it will take around an hour for the first s’more to melt while the first s’more cooks we built a second solar oven to test out if adding black paper to the inside of the solar oven
would make a difference in the oven’s air temperature we then took the oven outside, placed a s’more into the oven, sealed it up and left it in the sun After about an hour outside at a temperature of 30 degrees Celsius we
tested the temperature of the air within both ovens. The oven with only aluminum foil had an air temperature of 65 degrees Celsius The oven with black paper reached a higher temperature of 75 degrees Celsius In this side-by-side
comparison you can see that the oven with the black paper had a much easier time melting the chocolate Once your s’more is melted, remove it from the oven, grab a second graham cracker, place it on top and enjoy. Let’s look at this experiment a little closer All ovens require an energy source to cook or melt food, some use electricity and others use fuels like gas but they all convert energy into heat. In the instance of our solar oven the energy source is the Sun. The Sun produces high amounts of energy in the form of light The light from the Sun takes around
eight minutes to reach earth Once the light reaches Earth it beams down onto our solar oven the opening in the top of our oven lets light enter the oven and the angled flap which is coated with aluminum foil helps to reflect
additional light which would normally miss the oven’s opening into the oven When light enters the oven it transfers energy to the air molecules by a method known as radiation which converts light into thermal energy raising the ovens air temperature The thermal energy within our oven will quickly transfer to the environment unless a thermal insulator is used to trap the
heat within the oven Thermal insulation is the process of inhibiting the transfer of thermal energy from one area to another a pizza box is a great
thermal insulator pizza boxes are made to keep a piping hot pizza from getting
cold by slowing the conduction of thermal energy to the environment An insulated box keeps all the
collected energy within the oven and allows the air temperature to rise much
faster and higher than it could without thermal insulation But why did the temperature in the oven with the black paper get higher than the one without? The color black is great at absorbing light and a shiny surface like aluminium
foil is great at reflecting light when when aluminium foil is at the base of our oven. It causes the light that enters the oven to bounce around in back out which only
captures some of the energy from the light. The black paper on the other hand absorbs most of the energy from the light that touches it converting it to thermal energy and that energy is transferred to the air molecules The more energy from the light that is captured and absorbed the higher the
temperature our oven can get. As the temperature of the air in the oven rises it transfers its thermal energy to the s’mores we place inside causing them to
get soft and melt into a delicious snack That’s it for solar oven s’mores. Thanks for watching. If you enjoyed this episode let us know in the comments below and subscribe to future episodes And remember to like us on Facebook and follow us on twitter. And if you have any questions related to this episode or about science in general Let us know in the comments below or message us on facebook and we will try to help you out as best possible Thanks for watching! Bye! Bye! Those s’mores were delicious but I still can’t put my finger on what’s changed in this kitchen. Here at Sci Guys we’re always curious how experiments turn out. So if you do these experiments at home share a video or photo of them with
us on our Facebook or Google+ page but remember to always ask your parents
permission before you shared any photos

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