火の玉マジック／ The Magic of the Will-O’-the-Wisp

DENJIRO: Do you like scary stories? Have you ever heard of will-o'-the-wisp? Today, let me show you a floating will-o'-the-wisp. Of course, this is no supernatural phenomenon; it's science. Let me show you how it works. There is a glass tube attached to a plastic bag filled with flammable gas. When we bring a flame up to the end of the glass tube… the gas catches fire. Now, let me squeeze the plastic bag a little. The speed at which the gas is being emitted from the tube is faster than the speed at which the gas burns, so the flame cannot reach the opening of the tube. As a result, it seems like the flame is floating in air. Next up, let me show you a running will-o'-the-wisp. I'm going to apply lighter fluid to the groove around this ring. Let me put a flame up to it. Now I'm going to add more lighter fluid. You can see that the whole ring is on fire. This is because there's more gas that vaporizes. However, when we use less fluid, the vaporized gas burns out, and the flame moves sideways because the gas right by it catches fire. This gets repeated and gives the impression that the flame is moving. Next up, let's use this hose right here. I'm going to continuously send in flammable gas mixed with air. Just like before, the fire kept on moving because the gas kept catching fire. Now, what'll happen when the flammable gas is replaced with a mixture of hydrogen and oxygen? For this experiment, I've wrapped the hose around my body. Let's give it a go! The hose lit up for a second there. That burned super fast because the mixture of hydrogen and oxygen burns very fast. I hope energy will bring you all happiness. Our magic word is "Happy Energy!"