Abstract
High-speed visualization identifies the formation mechanism of microscopic saliva droplets during the phonation of plosive consonants: as moist lips open, there is a sequence of film formation and rupture into vertically attached filaments, which subsequently extend over centimeter-scales and destabilize into droplets due to the fast airflow of speech. The formation process ties this aerosolization mechanism to drop formation in wind instruments and to meter-long, speech-driven transport important to asymptomatic transmission of airborne pathogens.
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