Masking and microns. A virus can easily ‘squeeze through’ the pores of a surgical mask
For a mask to work, it needs to filter out particles. This requires that the pore size of the mask be smaller than the particles it is filtering. It also requires a tight fit: no leaks. If there is a bit of a charge on the mask that repels particles, as intended with new N95 masks, all the better.
See the particle size comparison in…
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