I also questioned the vialibily of face masks early on in the the covid scare..
I have grown mushrooms at home for many years and to prevent contamination entering my grain bags and jars, I have to use an extremely fine filters.
I use a Microppose Synthetic Filter Discs which have a 99.97% Filtration efficiency down to 0.22μm (microns).
The standard face mask is 0.3μm and is 95% efficient at 0.3 microns. This means that the filter media is effective at filtering 95% of airborne particles as long as they are larger than 0.3 microns in diameter.
The Coronavirus molecules tend to be about 0.1 microns in diameter
Masks do not prevent Coronavirus molecules from passing through the mask, However, Coronavirus molecules do not float freely around in the air and usually travel around as part of fluid droplets that become airborne created by coughing and sneezing.
These droplets are supposed to be about 0.5μm so the masks could prevent water droplets from entering the body.
I have grown mushrooms at home for many years and to prevent contamination entering my grain bags and jars, I have to use an extremely fine filters.
I use a Microppose Synthetic Filter Discs which have a 99.97% Filtration efficiency down to 0.22μm (microns).
The standard face mask is 0.3μm and is 95% efficient at 0.3 microns. This means that the filter media is effective at filtering 95% of airborne particles as long as they are larger than 0.3 microns in diameter.
The Coronavirus molecules tend to be about 0.1 microns in diameter
Masks do not prevent Coronavirus molecules from passing through the mask, However, Coronavirus molecules do not float freely around in the air and usually travel around as part of fluid droplets that become airborne created by coughing and sneezing.
These droplets are supposed to be about 0.5μm so the masks could prevent water droplets from entering the body.
I still have my doubts though.