 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the T-Bag Rocket. As always, adult supervision is required. What you need for this experiment is a T-Bag, a plate, a lighter, scissors, and a room without a draft. A couple safety precautions here is a potential fire hazard. This demonstration shall always be under adult supervision. The T-Bag will lift off almost every time vertically, but however, if there's any drafts in the room, it will change the past. Maybe it knocks over, but the heat will make it rise up. So this experiment should always be performed away from any flammable materials. So we're going to start off with our T. I use Earl Grey. You can use other bags. I tried Lipton T and it did not work at all. It just burnt the cylinder. So what we do here is you're going to take your T and you're going to open it up. If it has a string, we're going to cut that string off. So without tearing the cylinder, paper cylinder there, so be very careful. If it has a staple, you're going to remove the staple very carefully without ripping the bag. So there it is, strings off. Now we're going to do probably the cardinal sin for all you people to drink tea. We are going to pour the tea leaves out. So we are not having tea today. So I know that will disappoint some people. Put your finger in the cylinder on both ends because you want it to be a cylinder. Hence the name cylinder, right? So once you get it into a cylinder, you're going to put it on a plate, right? So we're going to put it on a plate and straight up and you need a room that does not have a draft in it. If there's a draft in it, it will blow over like that. And sometimes one side stands better than the other. Then once we have it set up, you're going to ask the question, what happens after I light the tea bag on the top? So we light the tea bag on the top, you ask the kids before you light it, what's going to happen to the tea bag? And hence the name, it takes off just like that. It's pretty awesome. Here's slow-mo and the science behind it. There are three principles acting on the cylinder that you made from the tea bag that makes this experiment work. The first principle involves the density of the air with the cylinder as it compares to the air on the outside of the cylinder. The flame burns down the tea bag, it heats up the air that's contained inside the cylinder. This excites the individual air molecules causing them to move more quickly and spread them out within the cylinder. This experiment also demonstrates the second principle, convention currents. As we just explained, the burning tea bag creates hot air, less dense air. This creates a thermal or a convention current. The space created by the less dense air inside the cylinder allows the dense air outside to push upward from the bottom. That movement of current in the air referred to as a convention current. Here we go, blast off, and you can see it's still kind of lit up a little bit of flames. And then right when it gets to the ceiling, it's completely out and it is safe for the kids to catch. As you'll see with my hand right here, it's the fun part of the kids running over and grabbing the ash. It's pretty awesome. But that isn't enough to create the rocket you just saw at the end of the experiment. The third principle, as the bag of tea burns, it turns into both the ash and smoke. The smoke lifts away and dissipates into the air, leaving just a delicate ash frame. Since the ash is so lightweight, the force of the rising hot air is strong enough to pull and lift the ash into the air. This is an experiment we really like to do after dinner when we have company over. So I hope you enjoyed this video. Remember to click thumbs up or to share if you enjoyed it. And thanks for watching.