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Researchers announced that masks reduce the risk of spreading large droplets that can transmit Covid-19 infection by talking or coughing by up to 99.9%, according to a new laboratory experiment conducted on mannequins and humans.
They wrote in the journal “Royal Society Open Science” that a woman standing six feet from a man who coughs without a mask would be exposed to such drops 10,000 times more than if she were wearing a mask.
Lead author Ignacio Maria Viola, an expert in applied fluid dynamics at the Faculty of Engineering at the University of Edinburgh, explained that large respiratory droplets that come out as droplets and act as projectiles before falling to the ground by gravity, are probably the main driver of the transmission of the SARS-Cove virus. 2.
The smallest and finest droplets, which form so-called aerosols, which are suspended particles, can remain suspended in the air for longer periods and represent a danger, especially indoors in poorly ventilated places, especially if they are crowded with people who do not they wear a muzzle or misplace it, under the nose.
“We constantly inhale a variety of droplets, from microscale to millimeter, and some droplets fall faster than others, depending on the particular temperature, humidity, and airflow rate,” said the researcher.
The study focused on particles larger than 170 microns in diameter, roughly two to four times the width of a human hair.
Aerosol particles that tend to follow air currents are described as smaller than 20 or 30 microns.
“In our study, we are talking about a 99.9% decrease in the largest falls that we measure,” said Ignacio María Viola.
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