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Slide 011 |
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Before going into the production of infectious nuclei, a few words are in place about the physical properties of droplets. In moisture-saturated air, the time it takes for a droplet to fall to the ground is inversely proportional to its size: very small droplets take a long time to reach the ground from 2 meters above ground, while large ones reach it very fast.
The height above ground of 2 meters is taken as a rough approximation (though a bit exaggerated) from where standing adults talk.