Why are stinky farts generally warmer and quieter than regular farts?
Most fart gas comes from swallowed air and consists largely of nitrogen
and carbon dioxide, the oxygen having been absorbed by the time it
reaches the anal opening. These gases are odorless, although they often
pick up other (and more odiferous) components on the way through the
bowel. They emerge from the anus in fairly large bubbles at body
temperature. A person can often achieve a good sound with these
voluminous farts, but they are commonly (but not always!) mundane with
respect to odor, and don't feel particularly warm.
Another major source of fart gas is bacterial action. Bacterial
fermentation and digestion processes produce heat as a byproduct as
well as various pungent gases. The resulting bubbles of gas tend to be
small, hot, and concentrated with stinky bacterial metabolic products.
These emerge as the notorious, warm, SBD (Silent-But-Deadly), often in
amounts too small to produce a good sound, but excelling in stench.
http://www.jeffssite.net/Fartfacts
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