I think it’s mostly because the mask slows down the flow of exhaled air, which reduces the distance the droplets travel before they evaporate or fall to the ground. You can see this illustrated here and what happens without a mask here.
I think it’s mostly because the mask slows down the flow of exhaled air, which reduces the distance the droplets travel before they evaporate or fall to the ground. You can see this illustrated here and what happens without a mask here.