How exactly do we spread droplets as we talk? Engineers found out.

Technology Org  October 13, 2020 Using high-speed imaging an international team of researchers (France, USA – Princeton University) has shown how phonation of common stop consonants, found in most of the world’s spoken languages, form and extend salivary filaments in a few milliseconds as moist lips open or when the tongue separates from the teeth. Both saliva viscoelasticity and airflow associated with the plosion of stop consonants are essential for stabilizing and subsequently forming centimeter-scale thin filaments, tens of microns in diameter, that break into speech droplets. The plosive consonants induce vortex rings that drive meter-long transport of exhaled air, […]