In a study conducted at Florida Atlantic University cough particles can be seen to linger suspended for up to 1.5 minutes at distances of over 8 feet (7.3 meters) away in still air.
Manhar Dhanak, Ph.D., Chair of FAU’s Department of Ocean and Mechanical Engineering, and Director of FAU’s SeaTech, (Photo by Alex Dolce)
“In the case of light coughing, it can lead to formation of vortex rings in which the particles and droplets ejected in the cough-jet remain confined to evolving toroidal flow structures,” said Dhanak. “The rings appear to travel 1 to 9 feet or more before getting diffused and breaking up. We found that wearing a face mask doesn’t stop the particles 100 percent, but it does slow down the cough jets.”
Full article is here: https://www.fau.edu/newsdesk/articles/mechanical-cough-coronavirus.php
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