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 that bypasses the filter.
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. The last place finisher showed why when purchasing a face covering, you may not want to get fleeced. The fleece mask finished at number 14 on the list, worse even than wearing nothing at all. The experiments showed that you could still create quite a sheet storm while wearing the fleece mask. The average relative droplet count was 1.1. That means, on average, the person while wearing the fleece mask generated more droplets than when his or her nose and mouth were fully exposed.
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