Quantitative comparison of respiratory aerosol implicates speech as a principal driver in asymptomatic transmission of airborne disease

<p>Video recordings of breath and speech droplets.&nbsp;</p> <p>The first set of recordings shows breath droplets, enlarged in size due to nucleated condensation, while crossing a 0.7-mm thickness light-sheet at the original recording speed (120 f/s) and in slow motion (24 f/s).</p> <p>The second set of recordings shows droplets generated by speaking a single word, &lsquo;popeye&rsquo;, while traversing a low intensity (~0.1W/cm²) light-sheet of 13 mm thickness. The recordings are shown at the original recording speed (120 f/s), in slow motion (24 f/s) and after background subtraction of Raleigh scattering and other time-invariant sources of light.</p>