3 ms·

https://youtu.be/Y47t9qLc9I4 https://youtu.be/Y47t9qLc9I4 this minutephysics video might answer your question

• eth0up 5y ago
  Solid math and reasonable general principles, with an element or two I question. He comes close to clarifying it, though not quite. And while the percentage of 50 was a disposable placeholder to illustrate valid points, I doubt cotton could be quite so effective as 50% leading to 75% (and certainly not 100%) and some assumptions are required to flow along with the logic, as was mentioned. This is still reasonable for a fast-paced video; some finicky details must be overlooked. However, it is primarily based on math and no data was shown giving any unambiguous indication for cotton efficacy. Also, he addresses directionality as nearly equal for the illustration, but later provides another resource that accounts for it in detail. Was this prefactored? Otherwise surprisingly apropos and worthwhile. Thank you
  • rnjesus 5y ago
    you’re welcome. i’m a bit low on sleep so i missed part of your question, and don’t think the video addresses it — that is, are two [cotton] masks more effective than one. i honestly think that this is an interesting question. for most people, their intuition would be to answer “probably,” but i suspect there are some complexities that someone smarter than i am would have to address. wearing two masks instead of one wouldn’t make things worse, though. but better? again, good question.