Wearing a mask

We are in a pandemic of a disease that spreads through the air so when I go into an enclosed space like a shop, I wear a face mask over my mouth and nose. It is the rule to wear a mask but even if they said it is not compulsory, I would still wear one. At first I had issues with covering my nose because it would cause my glasses to fog up, but then I found a way to stop condensation forming on my glasses, what I do is I pull the edge of my mask under my glasses and press my glasses down on the fabric, that usually stops the condensation. It is my understanding that the viruses can't propel themselves, the mask scatters the flow of air as I breathe out and that causes any virus particles to fall on the floor straight away so they can't spread by being suspended in the air as much. The mask won't stop me catching viruses but it will make any viruses I have fall on the floor more quickly, some of the viruses will still manage to stay suspended in the air but most of them will fall on the floor straight away in less than 2 meters because my mask has scattered the air flow from my mouth and nose into an erratic non linear spurt. That is why I wear a face mask in public places.