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Why does farts make noise?

3 Answers

Farting noise comes from vibrations of the tissues in the anus, which is propagated by the air molecules expelled.

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A fart's sound depends on the velocity of expulsion of the gas and the tightness of the sphincter muscles of the anus. Contrary to a popular misconception, fart noise is not generated by the flapping of the butt cheeks.

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vibrations caused by the friction of pressurized gas rapidly moving through the lose floppy anal orifice creates the sound

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