 Welcome back to Kids Find Science. My name is Ken. Today's experiment is the solar oven. As always, adult supervision is required. What you need for this experiment is a pizza box, a skewer, foil, tape, ruler, plastic wrap, black paper, box cutter, and a hot day. Which I have as today is 104 degrees in Northern California, so we're going to do the solar oven. To set this up, I'm going to do two different experiments. The first one is with a pizza box, and the second one is a regular box. So I'm going to outline the pizza box about an inch away from all the corners. And so you do all four of those corners like this, and then you're going to take a box cutter and cut that out. So now we have all the lines traced out. We're going to use a box cutter and be very careful. A box cutter can cut you very badly. So have adult supervision. And we're going to cut out three sides. The front of the box that pivots up on what I'm cutting right now, and the two sides, not cutting the back part of it. You just want to stop about an inch in there, and then you can flip it up just like this. So you don't cut all four sides. But if you do, you can just tape it on. Anyway, so there it is. That flips up just like that. And then now we're going to take some aluminum foil, and we're going to foil the piece that we just flipped up. So go ahead and pull out a piece of foil, and you lay it on the back just a little bit bigger than the flipped up piece itself. You're going to fold it over, and then we're going to use scotch tape or any kind of tape to tape it to the top part of the box, which I'll show you in just a second. So now I got the top part of the piece that we cut out, and now I'm just taping it so it stays on securely. It's better to have the tape on the outside than inside the oven because of any toxic fumes that could come off the tape, which shouldn't really, but this way we're more safe because the tape is always going to be to the outside of the oven. And so I'm going to tape that all the way so it doesn't rip off, and then once I get that done, we are set on that piece of it right here. And that's the part that the sun's going to see. So now we're going to make it like a glass window. So we're using plastic wrap, surround wrap, and we're going to go over the top of it and we're going to tape it down. You want this stretched out nice and tight. Now my piece wouldn't cover the whole box. So A, I could have measured the box and just cut the piece if I was really smart ahead of time and had it fit this piece. But you can use two different pieces that I'm going to show you here. And so you make sure you pull that tight. And then what we're going to do is tape the sides and then we're going to come back and tape the bottom and then we'll add a second piece in and just a second. So I ended up finishing the taping. I've got a little fast chair and I taped all the sides and then I'm going to add a second piece. So now I've got a second piece on there too. Now I flip it all the way upside down and I'm going to put a second piece of plastic or surround wrap on the bottom part. Because you do not want any air getting in or out. And so this will be helpful. This is optional. You don't have to do this, but I find it seems it works pretty good for me. It doesn't take up on the do. So same thing. Get your Saran wrap. Put it in. You're going to use two pieces again. Tape it all the way down. Cut it out so it fits in and I will speed it up and we'll get to the part where I finish. We'll put it in fast motion here and we will get that piece done and cut it off and then tape this perish really quick. And then I added one more piece to complete the whole thing. So now I've got my plastic lid over the cut out portion. Now I'm going to layer the inside of the pizza box. So the foil is covering the whole bottom of the box. So you kind of just want it to fold over to the end. And then you're going to cut the aluminum foil just about halfway to the side of the box so we can tape it down again. You really don't need to tape it. But I find after you move it around a little bit, it is a little bit better if we tape it. So then you're going to also have a second piece right here that you're going to cover up the rest of it. So once we get the first piece here, I am going to cut the foil or you could actually just measure it right the first time where I didn't measure right the first time. And then you're just going to tape that piece right here. And you're going to do this on the same on both sides. So I will speed it up and we'll get this done. So I'm doing this side right here. I got it fast forward so it's going quick. I'm going to cut the piece this time as being smart and learning from my mistakes the first time. Cut it in so it fit in just right. I don't use any tape on the inside but I'm going to tape the outsides of them so it holds down. Then you're going to cut out a piece of black paper, put it on the bottom of the pan. Then I just took a regular pie tin and put my s'mores. Now the recipe is a little bit different here. Instead of putting the chocolate, the graham cracker chocolate, the marshmallow. When you use a solar oven, find it better if you use the graham cracker marshmallow chocolate. Because the marshmallow, you need to cook a little longer so it works better this way. But you can try it both ways. Then you're just going to close the pizza box. If you feel like it's not closing all the way, you can tape the sides on temporarily. You can see mine's not really holding there. So I'm going to end up taping those sides down. Now I've got those sides taped. You take your skewer and you put it in. There's little holes on the side of the pizza box. Prop it up against the little lid we have there. We're going to tape that in once we get it into the sun. You want it to angle the exact angle so you can see there's enough reflection coming down. So therefore, hence the name of solar oven, the piece standing up is going to reflect down into the tray. And the heat is going to come up and cook your s'mores. I did a second box here. This box is a little deeper. It's just a regular box. It can be any size. All I did was line it all with foil. And then I put a little corner edges around so it kind of goes all the way around. That's optional. Tape down all the outside of the foil. No tape on the inside. And then I put black on the bottom. And then a pipe hand I tipped upside down. I also put a thermometer in there so we can see the temperature this time. And then I covered it completely with saran wrap and taped it so it's completely sealed in. And I believe this is going to cook a lot faster because it has more area of aluminum. So I've got two different solar ovens going at the same time. We started off at zero. It's already at over 150 degrees inside that box. So we'll see where it gets to. So while I'm waiting for my snack to be done, I'm going to explain the science behind this. So the solar cooking is done by the means of the sun's UV rays. It is not the sun's heat that cooks the food nor is the outside temperature. Though this can somewhat affect the rate of the time required to cook as today being very hot. But rather it's the sun's rays that are converted into heat energy that cooks the shmores or other food. So the heat of the sun is trapped inside the box or the pizza box and it starts getting very hot. Ovens like this are also called collector boxes because they collect the sunshine inside. And as it sits out in the sun our oven eventually heat up enough to melt cheese or even cook a hot dog or like shmores like we're doing. How does this all happen? Well the rays of the light are coming to the earth at an angle. The foil reflects those rays and bounces them directly into the open box. Once it's gone through the plastic wrap it heats up the air that is trapped inside. Remember we sealed the plastic saran wrap. The black paper absorbs the heat on the bottom of the oven. So solar ovens can reach up to about 200 degrees Fahrenheit which today we got to 225 on a sunny day. And it can take a lot longer to heat things in a conventional oven. Although this method will take longer it is very useful and easy. And it is safe to leave alone while your energy from the sun cooks your food. This is a smore from the pizza box oven. Solar oven and you can see the marshmallow is very gooey and the chocolate is extremely melted. And then I will show you the other rocks. Alright so here we are we're going to open up the container. It's a little warm about 225 degrees. We're going to pull out our smore. It's coming everywhere. There is a little over an hour. It's delicious. Master solar oven. Thanks for watching. Remember to click thumbs up and to subscribe.