corkscrew and speed of sound.

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Julien, thanks for the useful phyphox code with many images. You have even took into account the end correction 0.61 D !!
Only a photo of the bottle used in the experiment is absent and it is unclear what equation has to be used .

As I understood, you have used the approximation by the \lambda/4 standing wave in a tube closed at one side.
If you have not yet finished the bottle an approximation by the Helmhotz resonator is more appropriate for the next opening.