Some percentage of vapour is going to be stopped. It's not going to be the majority.
Actually yes, the majority. At least my mask does (simple double layered knitted cloth, I just chopped the top of a beanie off).
That would indicate a significant impairment of airflow. That'll certainly cause problems for breathing.
Not true at all. I have zero problems breathing.
Blocking air is one of the things they find drastically reduces tolerability. Airflow is a poor test, because it is not linearly correlated with droplet blocking. Blocking airflow goes up much faster.
Reducing flow prevents it from traveling to another person. That's the whole point.
And masks increase the likelihood of touching the face for the majority of people. Easily observed in any inddor public area. And tallies with what research finds regarding mask comfort issues.
Even if that is true for some (I find the opposite happens, the mask reminds me not to touch), not wearing masks is much more likely to cause infections than touching ones own face.
Studies have also shown that moving air mitigates this. But just having virus particles floating around doesn't mean they can cause an infection. Influenza is a good example of being similarly infectious, but still mostly through droplets except in cases where you concentrate the smaller droplets in an area.
The virus doesn't survive an extraordinarily long time. It's survival time is quite ordinary.
Yes, virus particles floating in air will only cause infections IF they survive outside the human body for long enough to travel to the next person.
Coronavirus can survive outside the human much longer than influenza. Studies with equal loads of MERS, SARS-1 and H1N1 showed that H1N1 was not viable after 1 hour whereas the others were still viable after 48 hours.
Point is it most definitely survives longer than the 20 minute air time it gets when exhaled.