# Helmholtz Resonance

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omega_H =
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MichaelBartmess.Helmholtz Resonance
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The Helmholtz Resonance describes the phenomenon of air resonating  in a cavity.  The cavity in an applied case might be the cavity of an instrument like a guitar. We use a simpler geometric example in this equation to explain this simple phenomena observed when you blows across the mouth of an empty bottle.

In this equation the inputs are:

• A -- cross sectional area of the neck of the bottle (or correspondingly the cross sectional area of the sound hole of the guitar)
• P_0 -- static pressure in the cavity
• m -- the mass of air in the neck of the bottle (or correspondingly the opening of the sound hole)
• V_0 -- the static volume in the cavity