Abstract
The Rubens tube is a popular demonstration to teach students and the public about waves. To operate, a speaker is used to form pressure waves within natural gas in a tube, producing flames with varying heights. A Rubens tube was constructed for use in outreach and to measure the speed of sound in the propane gas used. The speed of sound was measured to be 365 m/s, a 41% difference from the value quoted in the literature. The tube was successful at encouraging curiosity among physics students and the general population alike.
