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The 1.5m distancing rule that so many governments (and sadly once more their lackey scientific experts) has very little to do with physical properties, but is c
by PeterStuer 7y ago
The 1.5m distancing rule that so many governments (and sadly once more their lackey scientific experts) has very little to do with physical properties, but is chosen so as to allow for the least possible required adaptations to factories and offices.
- gowld 7y agoThe video shows both real sensors and a simulation showing the vast majority of particles contained in a 6-ft range and then falling to the ground.
- PeterStuer 7y agoYour observations are correct, but your implied conclusion is not. In the 'real' environment micro-droplets are shown to be suspended for minutes. It is the larger droplets that are pulled down by gravity and do not make it far. But the micro droplets can contain more than enough virus particles. It is shown that the room gradually accumulates more and more suspended droplets as people continuously produce them, not just through sneezing and coughing, but just by talking and breathing. In a typical office environment there is continuous low velocity air circulation spreading these droplets through the room and saturating the whole space with them. The video shows also that cross drafts, which produce a high air replacement, can take the droplets outside of the room which is a good thing. The moment the draft is closed the accumulation starts anew.