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My understanding of how these masks are supposed to work is by preventing the fairly large water droplets that ordinarily issue from the mouth during speech, coughing, exhalation, etc. from becoming airborne or even hitting other people.You have to ask yourself how well they protect you if they allow you to breathe easier. Usually it’s an indication that air moves more freely through them. And if air is moving through them what else is? Typically the more restrictive the air flow the better the protection. N95 (without the air valves) offer the best protection. I haven’t seen many of these though.
New Design Helps N95 Mask Wearers Breathe Easier
The device prevents oxygen deprivation in coronavirus-blocking respiratorswww.scientificamerican.com
They obviously don't prevent air or water from passing through the mask entirely; I've seen masked people at bus stops in winter, and I can assure you that visible clouds of water vapour are coming through the mask. These may not be N95 masks, but I can also deduce that N95 masks must allow a considerable amount of water vapour through. If you've ever worn a neck-warmer, although it traps just a fraction of the vapour coming out of your mouth, your face and the neck warmer itself will be soaked with exhaled water vapour in under 30 minutes. Hence unless people wearing N95 masks have the captured water literally dripping down their faces, those too must ultimately allow it to pass through or vent it into the atmosphere somehow.
The "preventing large droplets" explanation is also the explanation I've read for why wearing a mask protects others, not the self. Although I admittedly have no idea why a stranger's mask wouldn't be as or more effective in protecting him from large droplets issued from my mouth than my mask. Perhaps you have some insights.
In any case, as I said earlier in this thread, I wear a mask and urge others to do the same not because I'm confident the masks actually do anything, but because they give people peace of mind, because respecting the law is the Christian thing to do, and because it can't hurt to wear one.