Rubens Tube basically “illustrates that sound in air is related to pressure variations in the air — telationship between wavelength, frequency, and wave speed. The speed of sound is higher in a lighter gas (methane) than in air.” Video after the jump.

Rubens Tube basically “illustrates that sound in air is related to pressure variations in the air — telationship between wavelength, frequency, and wave speed. The speed of sound is higher in a lighter gas (methane) than in air.” Video after the jump.