It's the aerosols that are present in the exhaled air that carry the virus. Don't be an ignoramous. Water vapour DOES NOT carry the virus, according to science. There is a diference between aerosols and vapours. And, there are enough chemists, scientists and engineers on this board that will tell you the same thing that I am telling you.Okay, lets play a little Q & A:
Do you admit coronovirus can be transmitted through exhaled air?? Yes or no??
Masks act as barriers against airborne aerosols. Plain and simple physics. Now, do you understand?