 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the science behind the friction erasable pens. As always, adult supervision is required. What you need for this experiment is a pilot friction pen or any kind of pen that has erasable ink. And I'll show that in the description where I got mine. So here's the friction pen with the erasable ink that I'll be using. There's multiple different kinds out there. I've just happened to be using the pilot. I'm going to do four different experiments. This one I'm going to make a grid. And then I'm going to save you from watching me do the entire grid and we'll come back when I finish it. So I just finished making the little graph here all over the paper with the erasable ink. We're going to have five different experiments starting off with the microwave. Experiment number one is to heat without the rotating plate. So we're going to turn it upside down where the rotating plate helps even out where the food gets cooked. So now it's not rotating. So we're going to be able to see with the experiment what actually cooks. So this was for 10 seconds and you can see there's just a couple spots here and there. But it's not really evenly cooking out the food. So I'll circle these so we know which parts were already done. Because I'm going to put it back into the microwave for 20 and 30 seconds. But I will just show you the results of the 30 seconds. So I'll set it here for 30 seconds and go ahead. And you can see there's it's right there and it's still like back and forth everywhere. So you can see that it's not cooking evenly and it's not cooking the food at all. So we'll do one more test. We're going to do one minute. So it'll be a little over a minute 30 here. And you can see it starts to cook the middle a little bit, but it's not evenly cooking the food. The microwave radiation waves are just kind of going everywhere because the plate is not moving. So it did it did cook the food in certain areas. You can see where the ink has disappeared, but it's not cooking it evenly. So we will go to experiment number two where I'm going to put the plate back in. So it's going to rotate this time. So we will see how that takes the ink. I did another sheet here and put it in and I'm going to start with 30 seconds this time instead of doing 10 seconds. And so we'll do 30 seconds in the microwave and turn it on. And I'll save you the time there and I'll come back to it now and open it up and look it's cooking from the outside. It almost made a complete circle and in the middle, which is pretty cool. Look at that. So this is 30 seconds. I just went straight on the 30 and it took out a lot of the ink. And you can see the rotating plate really helps on how the food actually gets cooked. So now we're going to do one more experiment with this. So you can see the difference there at the top by not being the rotating. So we'll do one more minute now rotating plate and we'll see what comes up. Look at that. A minute 30 and only the outside edges is touched, which is pretty impressive. So it actually cooked almost everything compared to the top here where it doesn't rotate and you can see that it doesn't evenly cook. So experiment number three is now we're going to write out Kids Fun Science. Everybody's favorite YouTube channel, right? Anyway, we're going to use a hairdryer. So with the heat, just by using the hairdryer and pushing it on, you can see that from a distance it's going to take all the ink. Now I found it kind of interesting that it came back. So if the ink is still kind of wet and I didn't write it enough, it still comes back immediately. If you go over it again like this, you see it completely disappears and there's absolutely no ink and that's what the hairdryer. Experiment number four. So I'm going to write out Kids Fun Science here and I'm going to use the tip of the pen, which is just a piece of hard plastic. And if you rub against it, you cause friction, which it creates heat and it erases the ink, which is pretty cool. So I tried to do it with my finger and I had to rub really, really hard, but I was able to create heat with my finger. I started to burn a little bit, so it wasn't fun, but I was able to erase the last part of the words just with my finger making friction. Pretty cool. The fifth and last experiment is to reappear the ink in the freezer. Experiment number five. So it's pretty incredible that you could put it in the freezer and have it because of the temperature dropped so much, the ink will reappear. So there it is. There's nothing really there in about 30 minutes, but on the top part with the ice, all the lines came back, which is pretty incredible. Then it's all back there and you can see my ink. So I switched it up on top and you can see all the words there. Kids Fun Science, like, share, subscribe. It's pretty cool. So thanks for watching and I hope you enjoyed this video. And if you did, make sure you share and I will see you on my next video. Hello?