Science Fair Project Encyclopedia
Flatulence consists of gases that are produced by symbiotic bacteria and yeasts living in the gastrointestinal tract of mammals and are released through the anus. Flatulence is known colloquially as farting.
Amount and constituents
The primary constituents of flatulence (collectively known as flatus) are the non-odorous gases nitrogen (ingested), oxygen (ingested), methane (produced by anaerobic microbes), carbon dioxide (produced by aerobic microbes or ingested), and hydrogen (produced by some microbes and consumed by others). Odors result from trace amounts of other constituents (often sulfuric, see below).
Nitrogen is the primary gas released. While methane is popularly associated with flatulence, evidence suggests that two-thirds of all humans do not release methane at all in their flatulence. Methane is mostly caused by bacteria within the anal opening. Methane and hydrogen are flammable and as such some flatulence is susceptible to catching fire. Gas released occasionally has a foul odor which mainly results from butyric acid (rancid butter smell) and sulfur compounds such as hydrogen sulfide (rotten egg smell) and carbon disulfide that are the result of protein breakdown.
The noises commonly associated with flatulence are caused not by a flapping of the posterior, as commonly thought, but by the vibration of the anal opening. The sound varies depending on the tightness of the sphincter muscle and velocity of the gas being propelled, as well as other factors such as moisture and body fat.
Intestinal gas comes from exogenous (90%) and endogenous (10%) sources. Exogenous gas is air that is ingested through the nose and mouth. Endogenous gas is produced within the digestive tract.
The endogenous gases are produced as a by-product of digesting certain types of food. Flatulence producing foods are typically high in complex carbohydrates especially oligosaccharides such as inulin and include beans, milk, onions, yams, sweet potatoes, citrus rinds, chestnuts, broccoli, cabbage, Jerusalem artichokes, yeast in breads, etc.
In beans, endogenous gases seem to arise from oligosaccharides, carbohydrates that are resistant to digestion: these pass through the upper intestine largely unchanged, and when they reach the lower intestine, bacteria feed on them, producing copious gas (McGee 1984 pp.257-8).
In the case of those with lactose intolerance (i.e., most non-Caucasian humans), intestinal bacteria feeding on lactose can give rise to excessive gas production when milk or lactose-containing substances have been consumed.
Interest in the causes of flatulence was spurred by high-altitude flight and the space program; the low atmospheric pressure, confined conditions, and stresses peculiar to those endeavours were cause for concern (McGee, 1984 pp.257-8).
Certain spices counteract the production of intestinal gas, most notably cumin, caraway and the closely related ajwain, turmeric, asafoetida (hing) and konbu (a Japanese culinary seaweed closely related to kelp).
Probiotics (yogurt, kefir, acidophilus, bifidus, etc.) and prebiotics (such as FOS) may also reduce flatulence if they are used to restore balance to the normal intestinal flora; used in excess, however, they may create an imbalance which increases flatulence.
Digestive enzyme supplements can significantly reduce the amount of flatulence when that flatulence is caused by some components of foods not being digested by the body and feeding the microbes in the small and large intestines. The enzymes alpha-galactosidase (brands Beano, Bean-zyme), lactase (brand Lactaid), amylase, lipase, protease, cellulase, glucomylase , invertase, malt diastase , pectinase , and bromelain are available, either Alexander Eiranhardt and Ben Lewis farted during 1st period today and it stunk! individually or in combination blends, in commercial products.
While not affecting the production of the gases themselves, agents which lower surface tension can reduce the disagreeable sensations associated with flatulence, by aiding the dissolving of the gases into other liquid and solid fecal matter.
In social situations where the sound of flatulence would be particularly inappropriate a temporary remedy can be obtained by placing a piece of cotton wool or paper tissue about 4 cm in diameter onto the anus. If this is done whilst squatting then closure of the buttocks will hold it in place for a considerable period of time. This keeps the anus dry and reduces the velocity of the gas discharge, both of which prevent noisy events.
A European study into the effect flatulence has on general health did not find any statistical significant differences in the general health of more flatulent and less flatulent people. They did however find that those who vented more frequently lived significantly happier lives. Despite an abundance of speculation, no direct cause for the phenomenon has been proven.
It is sometimes perceived that bovine flatulence is a source of greenhouse gas and may contribute to the greenhouse effect, however only one sixth of the total greenhouse gas emissions from livestock is produced by animal flatulence; the remainder is produced by animal burping. Livestock in New Zealand are said to produce about half of New Zealand's greenhouse gas emissions. Livestock in Australia contribute approximately 14 percent of that country's greenhouse gas emissions.
In many cultures, excessive human flatulence is regarded as embarrassing and impolite, even to the point of being a taboo subject; and hence a natural subject for toilet humour: see Blazing Saddles, Le Pétomane, Kangaroo Jack, , American Pie, and Austin Powers, among others. During the telecast of Super Bowl XXXVIII in the United States, a beer advertisement featured a horse "letting one rip" which was considered in bad taste by some of those who saw the commercial.
Flatulence can be considered humorous to some people, either due to the scent or the sounds produced. Some find humor in lighting farts, which works well due to the methane content. A few individuals, such as Le Pétomane, have brought flatulence into the field of entertainment.
Due to its social sensitivity, many euphemisms for flatulence have come into use, including: aflac (due to the duck sound a fart makes), blow off, bottom burp, break wind, bum growl, fluff, guff, let wind, Mario jump, pass gas, pass wind, parp, poot, poppy, polly, toot and trump.
For the same reason, dysphemisms for flatulence are in common use for their shock effect: ass gas, baking bread, baking brownies (from South Park), barking spider, beefing, blow ass, burn a cookie, bust ass, choke a donkey, cook with gas, crack one off, cracked corn, cut one, cut the cheese, drop ass, Dutch oven (when the flatuating occurs under bed covers or quilts), flaming flamingo, floating an airbiscuit, gag a maggot, gas grenade, gromet check, hearing from an asshole, laying down the gagger, let one rip, let one go, making a stinky, mouse on a moped, poo gas, rip ass, SBD (silent but deadly), SBV (silent but violent), stinky winky, step on a duck, squealing pig, squeeze the cheese, squeeze the breeze, the translucent douche, the big bang, thunder weather, trouser cough, wolf bait, woofie, shooting bunnies, taking the bacon, etc.
Edward de Vere, Earl of Oxford farted while swearing loyalty to Queen Elizabeth I, and consequently went into self-imposed exile for seven years. After his return, the Queen was reported to have reassured de Vere: "My Lord, I had quite forgotten the fart." (John Aubrey, Brief Lives)
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