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source; www . heptune . com / farts . html


Where does fart gas come from?
The gas in our intestines comes from
several sources: air we swallow, gas seeping
into our intestines from our blood, gas
produced by chemical reactions in our guts,
and gas produced by bacteria living in our
guts.

What is fart gas made of?
The composition of fart gas is highly
variable.
Most of the air we swallow, especially
the oxygen component, is absorbed by the body
before the gas gets into the intestines. By
the time the air reaches the large intestine,
most of what is left is nitrogen. Chemical
reactions between stomach acid and intestinal
fluids may produce carbon dioxide, which is
also a component of air and a product of
bacterial action. Bacteria also produce
hydrogen and methane.
But the relative proportions of these
gases that emerge from our anal opening
depend on several factors: what we ate, how
much air we swallowed, what kinds of bacteria
we have in our intestines, and how long we
hold in the fart.
The longer a fart is held in, the larger
the proportion of inert nitrogen it contains,
because the other gases tend to be absorbed
into the bloodstream through the walls of the
intestine.
A nervous person who swallows a lot of
air and who moves stuff through his digestive
system rapidly may have a lot of oxygen in
his farts, because his body didn't have time
to absorb the oxygen.
According to Dr. James L. A. Roth, the
author of Gastrointestinal Gas (Ch. 17 in
Gastroenterology, v. 4, 1976) most people
(2/3 of adults) pass farts that contain no
methane. If both parents are methane
producers, their children have a 95% chance
of being producers as well. The reason for
this is apparently unknown. Some researchers
suspect a genetic influence, whereas others
think the ability is due to environmental
factors. However, all methane in any farts
comes from bacterial action and not from
human cells.

What makes farts stink?
The odor of farts comes from small
amounts of hydrogen sulfide gas and
mercaptans in the mixture. These compounds
contain sulfur. Nitrogen-rich compounds such
as skatole and indole also add to the stench
of farts. The more sulfur-rich your diet, the
more sulfides and mercaptans will be produced
by the bacteria in your guts, and the more
your farts will stink. Foods such as
cauliflower, eggs and meat are notorious for
producing smelly farts, whereas beans produce
large amounts of not particularly stinky
farts.

Why do farts make noise?
The sounds are produced by vibrations of
the anal opening. Sounds depend on the
velocity of expulsion of the gas and the
tightness of the sphincter muscles of the
anus. Contrary to a popular misconception,
fart noise is not generated by the flapping
of the butt cheeks. You can see proof of this
in the close-up video footage of Carl Plant's
fart on Mate-in-a-State .

Why are stinky farts generally warmer and
quieter than regular farts?
(Question submitted by many, many
people!)

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.


How much gas does a normal person pass per
day?
On average, a person produces about half
a liter of fart gas per day, distributed over
an average of about fourteen daily farts.


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