The tracer droplets’ diameter was estimated to be less than 10 µm based on Stokes’ law, and the observation that they could remain suspended in a quiescent environment for between 2 min and 3 min without significant settling.
All of the masks eject particles, it's just a matter of direction. The ones they like over the shields actually shoot the particles up and higher meaning they are suspended in the air even longer than if you were to sneeze downwards.
These masks are useless. If they worked, covid would not spread in countries like south Korea and Japan where they wear them religiously.
“ Our observations suggest that to minimize the community spread of COVID-19, it may be preferable to use high quality cloth or surgical masks that are of a plain design, instead of face shields and masks equipped with exhale valves.”
N95 fluid dynamics https://maga.win/cD3nT
Surgical mask fluid dynamics https://maga.win/KLPT4
Thanks! Finally a link to a science-based visual I can share with friends and family. Bookmarked.
You're welcome. I thought this paper was too good to not pass on.
It just confirms what most of know intuitively already knew.
That's not what the paper says.
From the paper:
The tracer droplets’ diameter was estimated to be less than 10 µm based on Stokes’ law, and the observation that they could remain suspended in a quiescent environment for between 2 min and 3 min without significant settling.
All of the masks eject particles, it's just a matter of direction. The ones they like over the shields actually shoot the particles up and higher meaning they are suspended in the air even longer than if you were to sneeze downwards.
These masks are useless. If they worked, covid would not spread in countries like south Korea and Japan where they wear them religiously.
Yep.
“ Our observations suggest that to minimize the community spread of COVID-19, it may be preferable to use high quality cloth or surgical masks that are of a plain design, instead of face shields and masks equipped with exhale valves.”
It actually does say that .