[youtube=http://www.youtube.com/watch?v=HpovwbPGEo... ...tific principles behind the Rubens' Tube (showing standing waves ) involved in this demonstration are explained at...
https://www.neatorama.com/2009/02/12/the-rubens-tube-physics-fire-awesome/
The Rubens' Tube: Physics + Fire = Awesome!...
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