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$\begingroup$ No diffusion does not take a long time. You can smell a fart across the room in seconds. Thermal layers is a different thing. $\endgroup$
– paparazzo
Commented Aug 23, 2015 at 2:53
4

$\begingroup$ @Frisbee Diffusion is fairly slow. The reason you can smell a fart quickly is the presence of large scale air currents in the room. Sure, "fairly slow" is qualitative, but for an easy example showing that it takes a significant amount of time for gases to diffuse through less than a meter of air, look at the famous demonstration of the reaction between ammonia and hydrochloric acid in gas phase. That's just to get the two gases in contact, not to fully mix the contents of the tube. $\endgroup$
– Jason Patterson
Commented Aug 23, 2015 at 5:28
$\begingroup$ youtube.com/watch?v=1PJTq2xQiQ0 $\endgroup$
– Curt F.
Commented Aug 23, 2015 at 18:49

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