Actually the public use masks horrendously, because the disposables most of us wear are only fully effective when they are dry and fresh, that is why in a medical setting they are often changed multiple times per day.
It's all about attracting or repelling fluids, for the techno speak it's hydrophobic(water repel) or hydrophilic(water attract). The little viruses / particles need conditions to be just right to float or move about, too dry and they get stuck, too wet and they get bogged, they want things just right like Little Red Riding Hood.
Now too wet isn't an option for masks, because the level of too wet needed to stop the virus will also stop you breathing. So too dry is the only viable option, but with every exhalation we make the mask a little more wet, and at some point the mask goes from being too dry to just right. At that time the virus slides over the fibres like butter on hot teflon, wraps itself in a little moisture packet, and gets fired at the next available passer-by with every sledge or expletive spoken, like a little viral bullet.
However, lucky for us one other aspect of a mask still keeps working, even when conditions have become just right for a virus a mask stops us firing out bigger particles, bigger heavier particles can travel further than small particles, bigger particles evaporate slower than small particles. Using a mask and restricting the particle size diminishes the chances of infecting somebody else, and to a lesser effect reduces your own chance of being infected.
It's all about attracting or repelling fluids, for the techno speak it's hydrophobic(water repel) or hydrophilic(water attract). The little viruses / particles need conditions to be just right to float or move about, too dry and they get stuck, too wet and they get bogged, they want things just right like Little Red Riding Hood.
Now too wet isn't an option for masks, because the level of too wet needed to stop the virus will also stop you breathing. So too dry is the only viable option, but with every exhalation we make the mask a little more wet, and at some point the mask goes from being too dry to just right. At that time the virus slides over the fibres like butter on hot teflon, wraps itself in a little moisture packet, and gets fired at the next available passer-by with every sledge or expletive spoken, like a little viral bullet.
However, lucky for us one other aspect of a mask still keeps working, even when conditions have become just right for a virus a mask stops us firing out bigger particles, bigger heavier particles can travel further than small particles, bigger particles evaporate slower than small particles. Using a mask and restricting the particle size diminishes the chances of infecting somebody else, and to a lesser effect reduces your own chance of being infected.
"Ruck, ruck, ruck, ruck ....... Ruck, ruck, ruck, ruck"

