Firewalking is the act of walking barefoot over a bed of hot embers or stones. It has been practiced by many people and cultures in many parts of the world, with the earliest known reference dating from Iron Age India c. 1200 BCE. It is often used as a rite of passage, as a test of strength and courage, and in religion as a test of faith.[1][2]
Modern physics has explained the phenomenon, concluding that the foot does not touch the hot surface long enough to burn and that embers are poor conductors of heat.[3]
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How to walk on red-hot coals | The Science of Firewalking | We The Curious
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Ethical Hacking NETLAB+ 13 - Testing Firewall Rules with Firewalking
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FIREWALKING WITH TONY ROBBINS UPW LONDON '17
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Firewalking in San Pedro Manrique, Spain
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Firewalking Canarias
Transcription
It's a wet and windy evening outside At-Bristol at the moment but not to worry because it's about to get a lot hotter. Just behind me you might be able to see a burning fire. Now, myself over eighty other people going to you raising some money for Saint Peter's Hospice which is a Bristol-based charity which helps to care for adults with life-limiting illnesses. Now, me and everyone else, we're gonna be walking across that... bare foot! So how is this actually possible? Thermal conductivity refers to an object's ability to transfer heat to another object. Here I have a piece of metal which I'm going to heat up with this blowtorch until it gets to about 400 degrees and that's going to be about the same temperature which the coals will be outside later on. Using our infrared camera we can see the piece of steel is now over 350 degrees. But if we switch back to visible light, and dim the lights... we can see that it's now glowing red-hot. This happens to the coals as well, and this incandescent red light is actually emmitted by the atoms of the metal and coals as they rapidly vibrate at these very high temperatures. The walk itself is made of coals and wood, which in turn are made mostly of carbon. Now, thankfully the walk isn't made of steel because this metal is a far better conductor of heat than the carbon. You've probably encountered thermal conductivity in your kitchen at home. Imagine having baked some muffins, now you can briefly place your bare hands inside the oven without them getting burned, because the air inside - despite being hundreds of degrees - is a very poor conductor of heat. But if you try to pick up the metal baking tray... that's a bad idea. So because carbon is such a poor thermal conductor and I'm going to be walking pretty quickly, those red hot coals aren't going to have enough time the transfer the heat to my feet, in theory. I think it's time we went back outside. So here we are outside At-Bristol, the coals are just over there. They're 400 degrees Celsius, and I'm gonna be walking on them with bare feet! But I'm willing it to put my feet where the physics is, and put this to the test. Let's give it a go. I've got to say, that is one of the most amazing things I've ever done. There was a moment just before I was about to walk when I was actually feeling pretty nervous and I was thinking, "Can I actually do this, and is the science behind this actually going to prevent my feet from burning?" But I'm here and I'm still in one piece with no burns at all. So that is the science of firewalking. For more flame-filled science, why not watch how to set fire to ice, and how to make a rocket. And, for more science every week click subscribe. Thanks for watching!
History
Walking on fire has existed for several thousand years, with records dating back to 1200 BCE.[4][unreliable source?] Cultures across the globe use firewalking for rites of healing, initiation, and faith.[4]
Firewalking is also practiced by:
- The Sawau clan on the island of Beqa, 10 kilometres (6 miles) to the south of Viti Levu in the Fijian Islands.[5][6][7][8] The phenomenon was examined in 1902 when it was already a tourist attraction, with a "Probable Explanation of the Mystery" arrived at.[9]
- San Pedro Manrique, a village of Soria, Central Spain
- Eastern Orthodox Christians in parts of Greece (see Anastenaria) and Bulgaria (see nestinarstvo), during some popular religious feasts.[10][11]
- Tribes throughout Polynesia, documented in scientific journals (with pictures and chants) between 1893 and 1953.[12]
Persistence and functions
Social theorists have long argued that the performance of intensely arousing collective events such as firewalking persists because it serves some basic socialising function, such as social cohesion, team building, and so on. Émile Durkheim attributed this effect to the theorized notion of collective effervescence, whereby collective arousal results in a feeling of togetherness and assimilation.[13][14][15] A scientific study conducted during a fire-walking ritual at the village of San Pedro Manrique, Spain, showed synchronized heart rate rhythms between performers of the firewalk and non-performing spectators. Notably, levels of synchronicity also depended on social proximity. This research suggests that there is a physiological foundation for collective religious rituals, through the alignment of emotional states, which strengthens group dynamics and forges a common identity amongst participants.[16][17][18]
Physics
Per the second law of thermodynamics, when two bodies of different temperatures meet, the hotter body will cool off, and the cooler body will heat up, until they are separated or until they meet at a temperature in between.[19] What that temperature is, and how quickly it is reached, depends on the thermodynamic properties of the two bodies. The important properties are temperature, density, specific heat capacity, and thermal conductivity.
The square root of the product of thermal conductivity, density, and specific heat capacity is called thermal effusivity, and determines how much heat energy the body absorbs or releases in a certain amount of time per unit area when its surface is at a certain temperature. Since the heat taken in by the cooler body must be the same as the heat given by the hotter one, the surface temperature must lie closer to the temperature of the body with the greater thermal effusivity. The bodies in question here are human feet (which mainly consist of water) and burning coals.
Due to these properties, David Willey, professor of physics at the University of Pittsburgh at Johnstown, points out that firewalking is explainable in terms of basic physics and is neither supernatural nor paranormal.[20] Willey notes that most fire-walks occur on coals that measure about 1,000 °F (538 °C), but he once recorded someone walking on 1,800 °F (980 °C) coals.[4]
Additionally, Jearl Walker has postulated that walking over hot coals with wet feet may insulate the feet due to the Leidenfrost effect.[21]
Factors that prevent burning
- Water has a very high specific heat capacity (4.184 J g−1 K−1), whereas embers have a very low one. Therefore, the foot's temperature tends to change less than the coal's.
- Water also has a high thermal conductivity, and on top of that, the rich blood flow in the foot will carry away the heat and spread it. On the other hand, embers have a poor thermal conductivity, so the hotter body consists only of the parts of the embers which are close to the foot.
- When the embers cool down, their temperature sinks below the flash point, so they stop burning, and no new heat is generated.
- Firewalkers do not spend very much time on the embers, and they keep moving.
Risks when firewalking
- People have burned their feet when they remained in the fire for too long, enabling the thermal conductivity of the embers to catch up.
- One is more likely to be burned when running through the embers since running pushes one's feet deeper into the embers, resulting in the top of the feet being burnt.
- Foreign objects in the embers may result in burns. Metal is especially dangerous since it has a high thermal conductivity.
- Embers which have not burned long enough can burn feet more quickly. Embers contain water, which increases their heat capacity as well as their thermal conductivity. The water must be evaporated already when the firewalk starts.
- Wet feet can cause embers to cling to them, increasing the exposure time.
A myth that persists is that safe firewalking requires the aid of a supernatural force, strong faith, or on an individual's ability to focus on "mind over matter".[22]
Since the 20th century, this practice is often used in corporate and team-building seminars and self-help workshops as a confidence-building exercise.[23][24]
See also
References
- ^ H2G2, Earth Edition. "Firewalking". H2G2. H2G2. Retrieved 2003-10-22.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^ Pankratz, Loren (1988). "Fire Walking and the Persistence of Charlatans". Perspectives in Biology and Medicine. 31 (2): 291–298. doi:10.1353/pbm.1988.0057. ISSN 1529-8795. PMID 3281133. S2CID 40278024 – via Project Muse.
- ^ Willey, David. "Firewalking Myth vs Physics". University of Pittsburgh. Retrieved June 29, 2010.
- ^ a b c Binns, Corey (2006-08-14). "World's Watch and Learn: Physics Professor Walks on Fire". Livescience.com. Retrieved 2007-04-13. (livescience.com)
- ^ Pigliasco, Guido Carlo (2007). "The Custodians of the Gift: Intangible Cultural Property and Commodification of the Fijian Firewalking Ceremony. Ph.D. Dissertation". Department of Anthropology, University of Hawai‘i. Sponsor: Institute of Fijian Language and Culture, Ministry of Institute of Fijian Language and Culture, Ministry of Fijian Affairs, Culture and Heritage. Retrieved February 8, 2018.
- ^ Pigliasco, Guido Carlo (July 2010). "We Branded Ourselves Long Ago: Intangible Cultural Property and Commodification of Fijian Firewalking". Oceania. 80 (2): 161–181. doi:10.1002/j.1834-4461.2010.tb00078.x.
- ^ Burns, Georgette Leah (1994). "Tourism Impact in Beqa". In R. J. Morrison; Paul A. Geraghty; Linda Crowl (eds.). Science of Pacific Island Peoples: Education, language, patterns & policy. Institute of Pacific Studies. p. 29. ISBN 978-9820201071.
- ^ Admin (February 15, 2016). "What is Firewalking in Fiji?". Captain Cook Cruises Fiji. Retrieved February 8, 2018.
- ^ Fulton, Robert (1902). "Art. XIII.—An Account of the Fiji Fire-walking Ceremony, or Vilavilairevo, with a Probable Explanation of the Mystery". Transactions and Proceedings of the New Zealand Institute. 35: 187–201.
- ^ Xygalatas, Dimitris, 2012. The Burning Saints. Cognition and Culture in the Fire-walking Rituals of the Anastenaria Archived 2012-09-02 at the Wayback Machine London: Equinox. ISBN 9781845539764.
- ^ Xygalatas, Dimitris (2011). "Ethnography, Historiography, and the Making of History in the Tradition of the Anastenaria" (PDF). History and Anthropology. 22: 57–74. doi:10.1080/02757206.2011.546855. S2CID 154450368.
- ^ "Firewalkers of the South Seas | The Fire Walking Temple (Ke Umu Ki Heiau)". Umuki.com. 2009-08-22. Retrieved 2015-05-19.
- ^ Durkheim E. ‘’The elementary forms of religious life’’. New York: Free Press 1995.
- ^ Vilenskaya, Steffy, Larissa, Joan (December 1991). Firewalking: A New Look at an Old Enigma (First ed.). Bramble Co. pp. 253. ISBN 978-0962618437.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ Leonardi, Lewis, Dr. (1998). The Ultimate Experience of Fire & Ice (1st ed.). Google Books: Davinci Press. ISBN 978-0966467703.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ Konvalinka, I., Xygalatas, D., Bulbulia, J., Schjoedt, U., Jegindø, E-M., Wallot, S., Van Orden, G. & Roepstorff, A. 2011. “Synchronized arousal between performers and related spectators in a fire-walking ritual”, ‘’Proceedings of the National Academy of Sciences 108’’(20): 8514-8519
- ^ Xygalatas, D., Konvalinka, I., Roepstorff, A., & Bulbulia, J. 2011 "Quantifying collective effervescence: Heart-rate dynamics at a fire-walking ritual",Communicative & Integrative Biology 4(6): 735-738
- ^ Houff, William, H. (2001-07-01). Infinity in Your Hand: A Guide for the Spiritually Curious (2nd ed.). Skinner House Books. ISBN 978-1558963115.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ "Can you walk on hot coals in bare feet and not get burned?". The Straight Dope. 14 June 1991. Retrieved 2007-04-13.
- ^ Willey, David (2007). "Firewalking Myth vs Physics". University of Pittsburgh. Retrieved 2007-04-13.
- ^ Walker, Jearl. "Boiling and the Leidenfrost Effect" (PDF). Cleveland State University. Retrieved 2015-05-19.
- ^ DeMello, Margo (2009). Feet and Footwear: A Cultural Encyclopedia. Macmillan. pp. 30–32. ISBN 978-0-313-35714-5.
- ^ Edwards, Emily D. "Firewalking: a contemporary ritual and transformation" (PDF). MIT Press. MIT Press. Retrieved 2015-10-17.
- ^ Reynolds, Ron, Denny (2005). The New Perspective: Ten Tools for Self-Transformation. Google Books: Trafford Publishing. ISBN 978-1412047852.
{{cite book}}: CS1 maint: multiple names: authors list (link)
Further reading
- Kendrick Frazier, The Hundredth Monkey: And Other Paradigms of the Paranormal—The author describes his participation in a firewalking exercise, his observations, and possible explanations of the phenomenon
External links
- Firewalking in San Pedro Manrique
- Can you walk on hot coals in bare feet and not get burned? from The Straight Dope
- Why Fire Walking Doesn't Burn: Science or Spirituality? from National Geographic
This page was last edited on 16 March 2024, at 20:36