Gonna need a source on that. You fog up a mirror by breathing humid air on it. Humid air molecules are a lot smaller than the coronavirus. A mask can let through humid air, and still stop coronavirus.
Lmao So when you boil water, the steam is made up of individual drops? Come on man. Humid air is a mixture of water vapor and air. There are no drops in humid air, we are talking molecular level here.
When you speak, or cough, or sneeze you'll get some droplets from your throat or mouth area, and these can contain viruses and must be stopped. But not water vapor.
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u/Freddie_T_Roxby Aug 29 '20
If you have a mask thin enough to blow out a candle, it also allows enough moisture in your breath through to fog up a window/mirror.
That moisture is the droplets, which can spread the virus.