Chemistry in farting
Chemistry in farting
Did you know that 99% of the fart is odorless?

farting is always an embarrassing thing, but the chemical composition of fart is still a serious scientific issue.

in fact, most of the content in fart is not smelly. The ingredients that form the fart include the gas produced by bacterial fermentation and the air swallowed. In terms of composition, there are almost 59% nitrogen, 21% hydrogen, 9% carbon dioxide, 7% methane and 4% oxygen in a person's fart. And these parts are odorless.

so, what's the smelling part? Historically, indole, trimethylindole, ammonia and short-chain fatty acids have been blamed for fart. However, later studies found that sulfides are the main causes of odor, including hydrogen sulfide, methyl mercaptan, dimethyl sulfide, dimethyl disulfide, dimethyl trisulfide and so on.

one of the more interesting points is to study a method of collecting fart samples, drainage method. And there is also a very magic diagram:

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PS: because it contains hydrogen and methane, it is indeed possible to ignite the fart. The following is a motion picture from MythBusters:

of course, generally speaking, you don't have to worry about XD caused by fart