Now, you may have seen Ruben's tube before. That's basically a pipe with a bunch of holes in it, and you pump inflammable gas, and light it on fire, so you basically create a row of Bunsen burners. What's really coolis to play some sounds into the tube, and you can actually set up standing waves. Thatis, there are areas, there are patterns of the vibration of the air where there's a lot of vibration in some parts and not very much vibration in other parts. Now, that affects the flow rate of the gas inside that tube into the atmosphere, and so it affects the height of those flames. So basically, you can visualize the standing wave pattern. I'm currently in Denmark with a team of physics and chemistry demonstrators who have taken this experiment to the next level. They've actually created a two-dimensional Ruben'stube, a whole plane of Bunsen burners, effectively. How many holes in this tube? - 2,500 - 2,500 in this Pyro Board? - Yeah - So we're gonna s...