Ruben’s Tube

Explanation: The classic physics experiment involving sound, a tube of propane and fire. Created for Flash Forward 2006, but useful in any case where you are not allowed to have fire. I push through the tube 449 Hz then higher frequencies, then some jazz and then some rock. This is real life sound visualization. 

Source: https://www.onlinecolleges.net/100-amazing-videos-for-teaching-and-studying-physics/