14 face masks, here are the best and worst for Covid-19:
Next, the research team asked a person to position his or her mouth at the hole and repeat the phrase, “stay healthy, people,” five times. Therefore, anything that would come of the person’s mouth, whether it’s small droplets or hot dog fragments, would subsequently hit the sheet of light, causing the light to scatter. In other words, any droplets or particles would scatter the sheet out of it.
The fifth through eleventh place finishers included four different two-layer cotton pleated masks and one one-layer cotton pleated mask. These fell in the zero to 0.4 relative droplet count range. So they caused some sheet to move around.Number seven was another type of N95 mask: one with an exhalation valve. This registered a relative droplet count ranging from 0.1 to 0.2. When using a N95 mask, check first whether it has an exhalation valve.
At number 12 was the knitted mask. Not surprisingly this mask had a pretty large range, going from a relative droplet count of around 0.1 to just under 0.6. A knitted mask tends to be like a politician’s speech, full of holes. And holes can let a whole lot get through to the other side.
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