Compressible air in a volume forms a mechanical spring for resonance

Evidence

The air inside a closed volume V, due to its compressibility, acts as a mechanical spring, and the moving air in the tube or opening above behaves like a mass. Together they make a mass–spring system that works as an acoustic resonator. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 157

Categorization

• DEFINE: Explains the physical mechanism behind the Helmholtz resonator concept.