 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is Teflon tape secret messages. As always adult supervision is required. What you need for this experiment is Teflon tape, which I'll have in the description where you can get sharpies and scissors. So you probably know about Teflon, right? It's that stuff that used the nonstick pans that make it nonstick. But you might not know of Teflon as also being a thread seal tape used by plumbers. The thread seal tape is also known as PTFE tape, Teflon tape, or plumbers tape. PTFE stands for polytetral fluoroline, right? So that's a scientific name. Pretty big word, but I'm just going to refer to it as Teflon tape. Teflon tape looks like regular tape and it's not sticky at all. It is used to wrap around the pipe fittings to give you that nice type fit. And it's not sticky, but it's very slippery. And I'm going to show you how to write secret messages with this. There are multiple types of Teflon tape. Here I have the yellow tape, which is used for gas. And I also have white tape that is used for water pipes. So to show you how it's done here is basically going to cut a piece of tape out as long as you kind of need it, maybe just a little bit longer of the message you're going to write because you want to be able to pull out the sides. So you're going to write down the message, you take your Sharpie. I'm using the yellow tape here. I know the light's a little bit not showing it exactly, but it was much easier to use the yellow tape as a lot thicker and easier to work with. When you write your message with your Sharpie, make sure it dries because we're going to be pulling the ends and make sure there's a left side to the left and right as I'm drawing those lines, where you could actually pull out to show your secret message. So from after you write down the secret message, now you're going to pull the sides out from the bottom and top stretching the tape all the way out. So it distorts the message. So therefore it's a secret message because you have to know to pull it back to be able to reveal the message. So you grab both ends now. That's why you have to have extra ends. And I'm going to put it down here and pull and you will reveal your secret message right here. Secret message. Pretty cool, huh? So I'll do it one more time. I've got it written down here. I wrote down Kids Fun Science, multiple different colors, and make sure you don't want to grab the ink. And then once you stretch it out and it's distorted, all you want to do is grab both ends and pull out the long way because it will not stretch. It goes back to the original shape no matter how many times you do it, which is pretty cool. So now this is with the white water pipe tape, which I found to be very extremely hard to use. It's not as thick as the yellow tape, the gas tape. And so I'd recommend not to use the white tape. I just had both, so I wanted to give it a try. And I'm glad I did because it was very hard to write on because it kind of wanted to stretch as you were writing it. And it was very, very hard once you pulled it apart to get it back together because it kept wanting to, you know, stick to itself and stuff. So it was very extremely hard to use and I'll speed it up so you can see. So here in fast motion when I pulled it apart, it did it pretty easy, but trying to get it to pull out was a little bit harder. It did work, but I do recommend yellow. So the science behind this is Teflon tape is made of polymer, which is a bunch of molecules linked together to form long chains. The Teflon tape polymer chains are aligned side by side and parallel to one another in a lengthwise direction, which makes it difficult to stretch the Teflon tape lengthwise. Widthwise, however, the tape stretches easily. When the polymer chains are pulled from the top to bottom, they slide over one another and reduce the number of chains in a section without breaking the chains themselves. Because of this, when the message is written on the tape, then stretched widthwise, the message becomes unreadable, but when the tape is then stretched lengthwise, the message becomes readable, hence secret message. I hope you enjoyed this experiment. If you did, please click like, share, and subscribe. And thanks for watching. Okay, that video seems really interesting. Oh, and that video too. Thank you right now. Don't do video, click on them at the same time. And those too. And the red subscribe button down below. And yeah, thank you. Thank you. Bye. Those two videos too.