The idea is to stop the respiratory droplets that contain viruses. Droplets measure on the order of micrometers, which is the range that surgical masks are made

The idea is to stop the respiratory droplets that contain viruses. Droplets measure on the order of micrometers, which is the range that surgical masks are made to be effective. A Google search result for droplet sizes: https://www.pnas.org/content/115/10/E2386 https://www.pnas.org/content/115/10/E2386 A Google search result for effectiveness of various masks related to particle size: https://blogs.cdc.gov/niosh-science-blog/2009/10/14/n95/ https://blogs.cdc.gov/niosh-science-blog/2009/10/14/n95/