I had totally no idea about the Krakatoa Tubes. I mean, i do know the Krakatoa volcano in Indonesia, but Krakatoa tubes? Periodic Table Videos reveal this crazy story in their latest video. Krakatoa Tubes are actually small tubes made of glass with some water inside. The tubes are closed and sealed air-tight. When they are put under fire, the water boils and pressure is built inside the tube. Finally, the glass explodes! But why are they actually called Krakatoa Tubes? Watch the following video to learn about this crazy story!