Trapped air in a cavity oscillates like a spring-and-mass system, producing Helmholtz resonance

Evidence

Another form of resonant absorber is based on the use of the resonance that occurs when air is trapped in a tube above an air space. This type of resonance is called a Helmholtz resonance and is the resonance that occurs in a beer bottle when you blow across it. The cavity acts like a spring, and the air in the tube above the cavity acts like the mass. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2059

Categorization

• DEFINE: Explains Helmholtz resonance through the beer-bottle example and its spring-mass analogy.
• QUESTION: Could this spring-mass model of air columns extend to how the ear’s own cavities resonate with ambient room modes?