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I have been trying without success to find the rate at which small particles, on the order of $3\cdot10^{-10}\mathrm{g}$, diffuse in air at room temperature $-$ say 20 to 25 degrees C.

The purpose of this is to determine how fast airflow needs to be in one direction to prevent typical-sized covid19 particles from diffusing in the opposite direction.

If the rate varies dramatically with an order-of-magnitude change in particle mass or over the specified temperature range, I'd like to know that as well.

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  • $\begingroup$ Hello! I have provided an edit to your question using MathJax (LaTeX) math typesetting. For future questions, you can refer to MathJax basic tutorial and quick reference. Thanks! $\endgroup$
    – jng224
    Commented Mar 17, 2021 at 19:15

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First, I'd be careful taking covid-19 ventilation advice from stack exchange. The latest advice from the UK institute of building services engineers is available for free here.

This paper discusses the motion of droplets, but not specifically covid 19, and this paper considers the effect of different ventilation schemes on the movement of covid 19 particles.

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