# Tag Info

## Hot answers tagged aerosol

3

I took a class once, and we had an approximate equation for an particle (equation sheet is still up): $$\frac{d\vec{v}}{dt}=\frac{\rho_{particle}-\rho_{air}}{\rho_{particle}}\vec{g}-\frac{3\rho_{air}C_D}{4\rho_{particle}CD_{particle}}\vec{v}|\vec{v}|$$ where $\rho$ is density, $\vec{g}$ is the gravity vector (usually $=g\hat{k}$ but can be changed if the ...

3

As I said in my comment, viruses aren't my area (concerning units). But the answer is actually unitless. The exact answer you seek is dependent on a couple of different variables: The speed of the exhalation (cough or breathing)+speed of wind The atmospheric stability Of course, the viral load of the exhalation is also important, but since you're asking ...

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