Fart lighting is the practice of igniting the gases produced by human flatulence, often producing a flame of a blue hue, hence the act being known colloquially as a "blue angel", "blue dart", or in Australia, a "blue flame". The fact that flatus is flammable, and the actual combustion of it through this practice, gives rise to much humorous derivation. Other colors of flame such as orange and yellow are possible with the color dependent on the mixture of gases formed in the colon.
Although there is little scientific discourse on the combustive properties of flatus, there are many anecdotal accounts of flatus ignition and the activity has increasingly found its way into popular culture with references in comic routines, movies, and television; including cartoons.
4(g) + 2O
2(g) → CO
2(g) + 2H
2S(g) + 3O
2(g) → 2SO
2(g) + 2H
The odor associated with flatus is due to hydrogen sulfide, skatole, indole, volatile amines and short-chain fatty acids. These substances are detectable by olfactory neurons in concentrations as low as 10 parts per billion, hydrogen sulfide being the most detectable.
Some of the gases are produced by bacteria which live in symbiosis within the large intestines of humans and other mammals. The gases are created as a by-product of the bacteria's digestion of food into relatively simpler substances. The oxygen and nitrogen component of flatus can be accounted for by aerophagy, while the CO2 component results from the reaction of stomach acids (HCl) with pancreatic bile (NaHCO3).
Because the methane, hydrogen sulfide, and hydrogen present are flammable, igniting the resulting gases can result in burns or explosions as well as the desired flame. Clothing, hair, or skin may catch fire and sensitive tissues can be damaged.
In popular culture
Many find a comedic value in fart lighting and the activity is increasingly represented in pop culture possibly because "for adults, the allure of the vulgar is regressionary and often secretly pleasurable."
- In the film Dumb and Dumber, Lloyd (Jim Carrey) successfully lights a fart as part of a grandiose daydream/fantasy sequence.
- Radio personality Howard Stern cites a fart-lighting scene for losing his popular show's first NBC affiliate when WVIT in Hartford canceled the show.
- In the 1999 episode "Spontaneous Combustion" of South Park, spontaneous human combustion is attributed to people's flatulence acting as the ignition.
On the 2nd of May 2000, a U.S. patent was issued for a "Toy gas fired missile and launcher assembly", a product that would allow one's "colonic gases" to be stored for later ignition to "fire the missile into space."
- Van Ness, M. M. and Cattau, E. L. (1985) Am. Fam. Practioner, 31;198-208.
- Hydrogen sulfide
- Levitt, M. D. and Bond, J. H. (1978) in Intestinal Gas and Gastrointestinal Disease
- BBC - h2g2 - Farts and Flatulence
- Dawson, Jim (1999). Who Cut the Cheese?: A Cultural History of the Fart. Ten Speed Press, ISBN 1-58008-011-1. ISBN 978-1-58008-011-8. Retrieved 2007-10-07.
- Mercer, Bobby (2009-04-18). How Do You Light a Fart?: And 150 Other Essential Things Every Guy Should Know about Science. Adams Media. p. 71. ISBN 9781440519871. Retrieved 2 October 2014.
- Twitchell., J. (1992). Carnival Culture – The Trashing of Taste in America. Columbia University Press, New York. p. 52.
- Fart Scenes in Movies
- Stern, Howard (1993). Private Parts. Simon & Schuster ISBN 0-671-88016-0. ISBN 978-0-671-88016-3. Retrieved 2007-10-07.
- Weinstock, Jeffrey Andrew (2008). Taking South Park Seriously. Albany, New York: State University of New York Press. p. 169. ISBN 0-7914-7566-2.
- Thompson, Paul (1999-11-06). Waikato Times (Hamilton, New Zealand). p. 14.
- Zanakis, Michael F.; Philip A. Femano (2 May 2000). "Toy Gas Fired Missile and Launcher Assembly". U.S. Patent Office, Patent number: 6055910; Filing date: Jun 1, 1998; International Classification - F42B 406. Retrieved 2008-01-10.