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Some farts stink. This is mostly due to the presence of small quantities of hydrogen sulfide gas and mercaptans. The diffusion coefficient of H2S gas in air is 0.2x10
-m²/s.
Imagine that you fart 1 meter away from a classmate. How long might you expect it would take for your classmate to smell this unwelcome olfactory intrusion if
diffusion were to be the main means of gas dispersal?
t=
S
Does your experience with intestinal gas jibe with this value? What are a couple of good reasons why not?
[Lesson: if you fart in a crowd, your best bet is to stay veeeerrrrrryyyyy still!]

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