Ok, this is the scientific evidence with supports the requested social distancing and use of masks during the current Covid outbreak.
Speech droplets generated by asymptomatic carriers of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are increasingly considered to be a likely mode of disease transmission. Highly sensitive laser light scattering observations have revealed that loud speech can emit thousands of oral fluid droplets per second. In a closed, stagnant air environment, they disappear from the window of view with time constants in the range of 8 to 14 min, which corresponds to droplet nuclei of ca. 4 μm diameter, or 12- to 21-μm droplets prior to dehydration. These observations confirm that there is a substantial probability that normal speaking causes airborne virus transmission in confined environments.
The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission | PNAS
The evidence says that Covid can be transmitted via speech. The reason we have been asked to wear masks, is that it is very possible to be infected with Covid and not show any signs or symptoms. By wearing the mask you stop the risk of you transmitting Covid to other people, it also protects to a lesser rate you from getting covid if you dont already have it.
The masks are like condoms for our breath, the aim is to stop the disease at point of expelation, not inhalation.
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