Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Apr 26, 2011
A speaker pumps sound waves into a long pipe, which for particular frequencies creates standing waves (resonance). Propane gas is pumped into the pipe, and leaks out a series of holes drilled on the top side, creating a wall of flame. When a standing wave is present inside the tube, the height of the flames reveals the unseen nodes and antinodes inside the pipe.