Why does farts make noise?
Farting noise comes from vibrations of the tissues in the anus, which is propagated by the air molecules expelled.
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.
vibrations caused by the friction of pressurized gas rapidly moving through the lose floppy anal orifice creates the sound
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