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A Flute is really just a tube with a hole in it. You blow across the hole and this sets the air inside the flute vibrating, which produces the note. The player covers and uncovers other holes along the length of the flute, changing the effective length of the tube: this changes the pitch of the note.

You can get the same effect by blowing across the top of a bottle. The pitch will change if you add water to the bottle, in much the same way.

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16y ago

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