There are one billion (one thousand million) nanometres (nm) in one metre.
Human hairs vary in thickness.
Chinese, Japanese, Thai, and Korean hair is about 90,000 nm in diameter.
Indian and Spanish hair is about 80,000 nm in diameter.
European hair is about 70,000 nm in diameter.
The Coronavirus family varies in diameter from 80 - 160nm
This Coronavirus (severe acute respiratory syndrome coronavirus 2, or SARS-CoV-2 or the Covid-19 virus) is 125nm in diameter
So approximately 560 Covid-19 viruses laid side by side would be about the same width as a typical European hair.
So if someone sneezes, does the virus fall to the ground in a gentle arc, bound up in sneeze droplets?
Or does it get wafted away on the wind?
The consensus seems to be that staying two metres from another person isolates you from them.
Does that apply if they sneeze or cough in your direction?
Does it suggest infected people have a miasma of viruses in the air around them that tapers off to nothing within two metres?
I just read an article where they said virus is 70-90 nm. What?
I think this puts a different slant on this when talking about the scale of each microbe of the disease in comparison to potential receptors of it. In other words, how efficient is it at transmitting itself?