3D30.45 ploop tubes S-111 Pull stoppers out of test tubes filled with water to different depths. The standard Reuben's tube. Sa-16 A gas filled tube with flames from a row of holes along the top and a speaker at one end. 3D30.50 Ruben's tube 19-3.5 Directions for building a Ruben's tube. S-130 Drill a line of holes along a downspout and drive one end with a loudspeaker and introduce gas in the other.
Flames indicate nodes and antinodes.
A horn driver is used as a sound source. The pressure is measured at each flame hole and the results are that the flames are larger at the pressure antinodes. Sa-17 Sawdust in a tube makes piles when driven by rubbing a rod attached to a disc. Kundt's tube Disc 11-03 Stroke a rod to excite cork dust in a tube. The cork dust in Kundt's tube is excited by a horn driver.