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If an airborne viruses density was increased, would it cease to be airborne?

Posted by JustWondering...

For most airborne diseases, transmission occurs via aerosols in the from of respiratory droplets. If the density of the virus is great enough, will the virus/respiratory droplet not be able to stay in the air? (obeying the laws of buoyancy) For instance, if the respiratory droplet was considered a boat and its "cargo" (the virus) was dense enough so that the average density of the both was greater than the than the fluid (air) would it cease to be buoyant?
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