Influencing resonant frequency

[Anna]

I was wondering: when the note we hear when blowing on a bottle is it’s natural frequency (or one of the harmonics), why does moving my lips (changing tenseness or angle of airflow) influence the pitch? Am I changing the bottle’s resonant frequency?

[Simon]

I don’t have a nice physical explanation of this phenomenon, I’m afraid. You are clearly including the resonant frequency(ies) of the bottle in some way.

[Author]

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