On the average a fart is composed of about 59% nitrogen, 21% hydrogen, 9% carbon dioxide, 7% methane, and 4% oxygen. Less than 1% is what makes them stink.
Uh, good to know.
Methane is actually made from feces, but I never knew farts could produce it, too! So, I suppose farts are almost like a gaseous form of feces. About the carbon dioxide: perhaps not all of it is expelled by exhaling, and some oxygen goes to flatulence after inhaling. Wait, most of a fart is nitrogen! That reminds me of laughing gas, so laughing gas could form from the nitrogen and the oxygen (I think, because that seems quite reasonable). The hydrogen might be from water consumed along with the oxygen.
The stinky stuff? Well, sweat doesn’t have a smell unless it comes in contact with bacteria, so the other tiny piece of what makes up a fart might be some bacteria (remember, it’s just less than 1%). That fun fact sure sounded interesting!
If you’re really interested in how a fart is made, I suggest you Bing it (search it up on Bing) and comment about it. 🙂 Perhaps I’ll do a bit of research…