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Timeline for How quickly do farts spread?

Current License: CC BY-SA 3.0

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Oct 26, 2016 at 0:49 comment added Lawrence B. Crowell youtube.com/watch?v=ADiI_-3TA3I
Oct 25, 2016 at 22:43 vote accept drunkBrain
Oct 25, 2016 at 20:20 history edited Lawrence B. Crowell CC BY-SA 3.0
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Oct 25, 2016 at 14:39 history edited Lawrence B. Crowell CC BY-SA 3.0
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Oct 25, 2016 at 13:05 comment added drunkBrain Assuming ideal gas, for example, how would I calculate how fast, say, 1 kilogram of gas diffuses at STP?
Oct 25, 2016 at 11:48 comment added Lawrence B. Crowell To do an explicit calculation one might have to do a Boltzmann calculation. In general the lighter the molecule the faster it will diffuse. Methane has a gram molecular weight of 16. This makes it bouyant and readily diffusable. This is though not the smell of flatulence. These are due to putrecine and related alkanamine molecules that are a carbon chain with amine $NH_2$ ends. These are heavier and tend to hug the ground.
Oct 25, 2016 at 11:28 history edited user36790 CC BY-SA 3.0
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Oct 25, 2016 at 10:58 comment added drunkBrain So solving for v, then integrating with respect to time would give me the particle location? Then how would I apply this to the mass of the entire gas body?
Oct 25, 2016 at 10:56 history answered Lawrence B. Crowell CC BY-SA 3.0