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Fire

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agriculture. Slash-and-burn agriculture is still common across much of tropical Africa, Asia and South America. For small farmers, controlled fires are a convenient way to clear overgrown areas and release nutrients from standing vegetation back into the soil. However, this useful strategy is also problematic. Growing population, fragmentation of forests and warming climate are making the earth's surface more prone to ever-larger escaped fires. These harm ecosystems and human infrastructure, cause health problems, and send up spirals of carbon and soot that may encourage even more warming of the atmosphere – and thus feed back into more fires. Globally today, as much as 5 million square kilometres – an area more than half the size of the United States – burns in a given year.
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activities. They include knowledge of which fuel to burn; how to arrange the fuel; how to stoke the fire both in early phases and in maintenance phases; how to modulate the heat, flame, and smoke as suited to the desired application; how best to bank a fire to be revived later; how to choose, design,
212:. Fire is a significant process that influences ecological systems worldwide. The positive effects of fire include stimulating growth and maintaining various ecological systems. Its negative effects include hazard to life and property, atmospheric pollution, and water contamination. When fire removes 531:
or "cool fires", as opposed to uncontrolled "hot fires", which damage the soil. Hot fires destroy plants and animals, and endanger communities. This is especially a problem in the forests of today where traditional burning is prevented in order to encourage the growth of timber crops. Cool fires are
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that could trigger a hot fire should it get too dense. They provide a greater variety of environments, which encourages game and plant diversity. For humans, they make dense, impassable forests traversable. Another human use for fire in regards to landscape management is its use to clear land for
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food, simultaneously increasing the variety and availability of nutrients and reducing disease by killing pathogenic microorganisms in the food. The heat produced would also help people stay warm in cold weather, enabling them to live in cooler climates. Fire also kept nocturnal predators at bay.
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from combustion does not disperse as readily in micro gravity, and tends to smother the flame). There are several possible explanations for this difference, of which the most likely is that the temperature is sufficiently evenly distributed that soot is not formed and complete combustion occurs.
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Bowman, D. M. J. S.; Balch, J. K.; Artaxo, P.; Bond, W. J.; Carlson, J. M.; Cochrane, M. A.; d'Antonio, C. M.; Defries, R. S.; Doyle, J. C.; Harrison, S. P.; Johnston, F. H.; Keeley, J. E.; Krawchuk, M. A.; Kull, C. A.; Marston, J. B.; Moritz, M. A.; Prentice, I. C.; Roos, C. I.; Scott, A. C.;
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were deliberately caused in which a ring of fire surrounding each city was drawn inward by an updraft caused by a central cluster of fires. The United States Army Air Force also extensively used incendiaries against Japanese targets in the latter months of the war, devastating entire cities
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in micro gravity allow more soot to be completely oxidized after they are produced than diffusion flames on Earth, because of a series of mechanisms that behave differently in micro gravity when compared to normal gravity conditions. These discoveries have potential applications in
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proportions, increasing fuel and oxidizer input in this balanced mix, increasing the ambient temperature so the fire's own heat is better able to sustain combustion, or providing a catalyst, a non-reactant medium in which the fuel and oxidizer can more readily react.
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Once ignited, a chain reaction must take place whereby fires can sustain their own heat by the further release of heat energy in the process of combustion and may propagate, provided there is a continuous supply of an oxidizer and fuel.
1068:. Fire cannot exist without all of these elements in place and in the right proportions. For example, a flammable liquid will start burning only if the fuel and oxygen are in the right proportions. Some fuel-oxygen mixes may require a 1091:, which removes combustion products and brings a supply of oxygen to the fire. Without gravity, a fire rapidly surrounds itself with its own combustion products and non-oxidizing gases from the air, which exclude oxygen and 1145:
application of water, which removes heat from the fire faster than the fire can produce it (similarly, blowing hard on a flame will displace the heat of the currently burning gas from its fuel source, to the same end);
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started to evolve in human populations at a similar point in time. The use of fire became progressively more sophisticated, as it was used to create charcoal and to control wildlife from tens of thousands of years ago.
1516:. Different species of plants, animals, and microbes specialize in exploiting a particular stage, and by creating these different types of patches, fire allows a greater number of species to exist within a landscape. 1237:. Complete combustion of gas has a dim blue color due to the emission of single-wavelength radiation from various electron transitions in the excited molecules formed in the flame. Usually oxygen is involved, but 1593:
Fire prevention is intended to reduce sources of ignition. Fire prevention also includes education to teach people how to avoid causing fires. Buildings, especially schools and tall buildings, often conduct
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and are quickly recycled into the soil. This loss of nitrogen caused by a fire produces a long-term reduction in the fertility of the soil, which can be recovered as atmospheric nitrogen is
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covering the flame completely, which smothers the flame as the combustion both uses the available oxidizer (the oxygen in the air) and displaces it from the area around the flame with CO
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Lentile, Leigh B.; Holden, Zachary A.; Smith, Alistair M. S.; Falkowski, Michael J.; Hudak, Andrew T.; Morgan, Penelope; Lewis, Sarah A.; Gessler, Paul E.; Benson, Nate C (2006).
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by removing any one of the elements of the fire tetrahedron. Consider a natural gas flame, such as from a stove-top burner. The fire can be extinguished by any of the following:
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in the gases. Much of the radiation is emitted in the visible and infrared bands. The color depends on temperature for the black-body radiation, and on chemical makeup for the
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in the atmosphere as never before, as the new hordes of land plants pumped it out as a waste product. When this concentration rose above 13%, it permitted the possibility of
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is the visible portion of the fire. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. If hot enough, the gases may become ionized to produce
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There are numerous modern applications of fire. In its broadest sense, fire is used by nearly every human being on Earth in a controlled setting every day. Users of
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in some countries as of 2023) to the flame, which retards the chemical reaction itself until the rate of combustion is too slow to maintain the chain reaction.
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Early humans harnessed fire as early as a million years ago, much earlier than previously thought, suggests evidence unearthed in a cave in South Africa.
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In contrast, fire is intensified by increasing the overall rate of combustion. Methods to do this include balancing the input of fuel and oxidizer to
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Gowlett, J. A. J.; Wrangham, R. W. (2013). "Earliest fire in Africa: towards the convergence of archaeological evidence and the cooking hypothesis".
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is emitted from soot, gas, and fuel particles, though the soot particles are too small to behave like perfect blackbodies. There is also
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such as oxygen gas or another oxygen-rich compound (though non-oxygen oxidizers exist), is exposed to a source of heat or ambient
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in inertial flight. This does not apply if oxygen is supplied to the fire by some process other than thermal convection.
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The adiabatic flame temperature of a given fuel and oxidizer pair is that at which the gases achieve stable combustion.
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Jones, Timothy P.; Chaloner, William G. (1991). "Fossil charcoal, its recognition and palaeoatmospheric significance".
852:; and so on. Detailed expositions of fire management are available in various books about blacksmithing, about skilled 737: 733: 3285: 3246: 2669: 818: 128: 1598:
to inform and prepare citizens on how to react to a building fire. Purposely starting destructive fires constitutes
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Morris, S. E.; Moses, T. A. (1987). "Forest Fire and the Natural Soil Erosion Regime in the Colorado Front Range".
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Population and Building Factors That Impact Residential Fire Rates in Large U.S. Cities. Applied Research Project
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Glasspool, I.J.; Edwards, D.; Axe, L. (2004). "Charcoal in the Silurian as evidence for the earliest wildfire".
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systems to minimize damage resulting from a fire. The most common form of active fire protection is
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services are provided in most developed areas to extinguish or contain uncontrolled fires. Trained
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of the burning material and intermediate reaction products. In many cases, such as the burning of
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Safford, Hugh D., et al. "Fire ecology of the North American Mediterranean-climate zone." in
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which allowed for the more rapid spread of fire. These widespread fires may have initiated a
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Fire has also been used for centuries as a method of torture and execution, as evidenced by
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The fossil record of fire first appears with the establishment of a land-based flora in the
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is below the flame temperature, so that it fuses and then solidifies as it cools, and
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reaction during combustion, but which enables the reactants to combust more readily.
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are fires ignited by government agencies under less dangerous weather conditions.
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Controlling a fire to optimize its size, shape, and intensity is generally called
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Baars, Hans; Smulders, Andre; Hintzbergen, Kees; Hintzbergen, Jule (2015-04-15).
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Retallack, Gregory J. (1997). "Neogene expansion of the North American prairie".
1791: 1556: 1533: 1529: 1479: 1377: 1369: 1364: 1293: 1285:, emits intense green flame, leading to its informal nickname of "Green Dragon". 1118: 1006: 982: 702: 532:
generally conducted in the spring and autumn. They clear undergrowth, burning up
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The ability to control fire was a dramatic change in the habits of early humans.
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Fire ecology and management: Past, present, and future of US forested ecosystems
1853:. National Wildfire Coordinating Group. October 2007. p. 70. Archived from 1092: 1060:/oxidizer mix, and is able to sustain a rate of rapid oxidation that produces a 4116: 4032: 3876: 3630: 3620: 2197:
Proceedings of the National Academy of Sciences of the United States of America
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If the oxidizer is oxygen from the surrounding air, the presence of a force of
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process, whereby they produced a warmer, drier climate more conducive to fire.
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The common distribution of a flame under normal gravity conditions depends on
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or they might use A and B class foam depending on what is feeding the fire.
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refers to any fire of natural causes that is monitored but allowed to burn.
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Wildfire prevention programs around the world may employ techniques such as
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or a combustible material, in combination with a sufficient quantity of an
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in the 1930s. Also during that war, incendiary bombs were deployed against
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Community Involvement in and Management of Forest Fires in South East Asia
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Where fire prevention and fire protection have failed to prevent damage,
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Fire is affected by gravity. Left: Flame on Earth; Right: Flame on the
1278: 1249:(HCl). Other possible combinations producing flames, amongst many, are 1222: 1181: 1096: 1088: 987: 977: 900:
states that nearly 80% of the world's power has consistently come from
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Philosophical Transactions of the Royal Society B: Biological Sciences
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constructed primarily of wood and paper houses. The incendiary fluid
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A flame is a mixture of reacting gases and solids emitting visible,
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solid remains of a combustible material left after a fire is called
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Foundations of Information Security Based on ISO27001 and ISO27002
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produce the familiar red-orange glow of "fire". This light has a
1084: 991: 921: 853: 614: 572: 533: 465: 454: 284: 245: 209: 2367:"The discovery of fire by humans: a long and convoluted process" 353: 3681: 2777: 1543: 1454: 1408: 1398: 1343: 1342:, as soot tends to rise to the top of a general flame, as in a 1309: 1191: 1026: 746: 508: 423: 389: 257: 253: 146: 1029:, other compounds are able to fulfill the role. For instance, 500:
and then heated over an open fire to the agony of the wearer.
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Fire, in its most common form, has the potential to result in
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for a large percentage of humanity by igniting fuels such as
194: 185: 176: 3088:, National Aeronautics and Space Administration, April 2005. 3069:, National Aeronautics and Space Administration, April 2005. 1142:, smothering the flame by displacing the available oxidizer; 4248: 3686: 3676: 2502:"Were Early Humans Cooking Their Food a Million Years Ago?" 1313: 1266: 1230: 1057: 1034: 1002: 948: 913: 889: 885: 753:, although its use did not gain public attention until the 598: 579:
raids in July 1943, which killed an estimated 50,000 people
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turning off the gas supply, which removes the fuel source;
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or modify stoves, fireplaces, bakery ovens, or industrial
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to generate heat and light made it possible for people to
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Between Two Fires: A Fire History of Contemporary America
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Swetnam, T. W.; Van Der Werf, G. R.; Pyne, S. J. (2009).
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air forces that had been created specifically to support
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Tending fire : coping with America's wildland fires
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and its compounds, evaluated in mid-20th century as a
311: 'Fire, a fire', which can be traced back to the 2689: 2589: 2254: 1773:, the Greek mythological figure who gave mankind fire 963:
if its melting point is above the flame temperature.
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to produce electricity. Fire is also used to provide
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vehicles employ fire every time they drive. Thermal
316: 3339:. Project FireFight South East Asia. Archived from 2152: 1346:in normal gravity conditions, making it yellow. In 609:, then using the resultant heat to boil water into 224:. Additionally, the burning of vegetation releases 69:. Unsourced material may be challenged and removed. 3129:Ecology: individuals, populations, and communities 2778:David P. Barash; Charles P. Webel (10 July 2008). 2455:"Million-year-old ash hints at origins of cooking" 1979:"SCIENCE WATCH; Burning Plants Adding to Nitrogen" 920:is used to heat water, creating steam that drives 3488:(2021): 337–392. re California and its neighbors 2120:Palaeogeography, Palaeoclimatology, Palaeoecology 1945:Annals of the Association of American Geographers 1451:) 1,300 to 1,600 °C (2,400 to 2,900 °F) 1383: 1095:the fire. Because of this, the risk of fire in a 469:Evidence of occasional cooked food is found from 4360: 3142:Federal Fire and Aviation Operations Action Plan 3126:Begon, M., J.L. Harper and C.R. Townsend. 1996. 358:(which is still preserved in the word "fiery"). 3460:Burning bush : a fire history of Australia 3450:Awful splendour : a fire history of Canada 2917: 2915: 2771: 2533: 2417: 3430:World fire : the culture of fire on earth 2985:"Ask Astronaut Greg Chamitoff: Light a Match!" 2585: 2583: 2581: 2190: 1641:used in vehicles and vessels are also tested. 1269:flames are similarly pale blue, while burning 749:was used in July 1944, towards the end of the 678:improvised from glass bottles, later known as 658:projectile weapons driven by burning gunpowder 411:plants. Apart from a controversial gap in the 3949: 3563: 3048:National Aeronautics and Space Administration 3009: 2534:Francesco Berna; et al. (May 15, 2012). 2499: 2315: 2250: 2248: 2246: 2117: 2071:"The microfossil record of early land plants" 228:into the atmosphere, unlike elements such as 2982: 2912: 2186: 2184: 1504:Every natural ecosystem on land has its own 1474:which includes fire behavior, dynamics, and 1149:application of a retardant chemical such as 1025:. Although the oxidizing agent is typically 867: 3135: 2578: 2146: 2068: 2062: 1942: 888:converts chemical energy into heat energy; 799:. Unsourced material may be challenged and 3956: 3942: 3570: 3556: 2243: 295:, and as a weapon or mode of destruction. 3605:Native American use of fire in ecosystems 3536:"20 Things You Didn't Know About... Fire" 2816: 2590:Bowman, D. M. J. S.; et al. (2009). 2561: 2551: 2420:Azania: Archaeological Research in Africa 2394: 2384: 2321: 2226: 2216: 2181: 2111: 2094: 1021:, does not proceed directly and involves 819:Learn how and when to remove this message 129:Learn how and when to remove this message 3425:(University of Washington Press, 2001). 2849: 1537: 1326: 1287: 1185: 1105: 981: 871: 716:during the Second World War, notably on 502: 448: 433: 140: 3814:International Flame Research Foundation 3012:"How does fire behave in zero gravity?" 2698: 2364: 1903: 1877: 1478:. Applications of fire science include 986:The balanced chemical equation for the 527:management. These fires were typically 488:as well as torture devices such as the 14: 4361: 3377:International Journal of Wildland Fire 3255:from the original on February 16, 2022 3010:Inglis-Arkell, Esther (8 March 2011). 2964:from the original on February 19, 2023 2900:U.S. Energy Information Administration 2452: 1602:and is a crime in most jurisdictions. 1512:patches, each at a different stage of 1221:, for example wood, or the incomplete 1001:Fire is a chemical process in which a 966: 540: 438: 3937: 3551: 3329: 3238:Fire Officer: Principles and Practice 3018:from the original on 13 November 2015 2933:from the original on February 2, 2023 2852:Alternative fuels and the environment 1847:Glossary of Wildland Fire Terminology 620: 27:Rapid and hot oxidation of a material 3907: 3234: 2951: 2655: 2512:from the original on 4 February 2020 1824:are not included by this definition. 797:adding citations to reliable sources 764: 492:, which could be filled with water, 396:. Wildfire is first recorded in the 303:The word "fire" originated from 67:adding citations to reliable sources 38: 3357:Kosman, Admiel (January 13, 2011). 3280:(3rd revised ed.). Van Haren. 2699:Krajick, Kevin (16 November 2011). 2481:from the original on 1 October 2019 1648:can mitigate the financial impact. 916:in the past decades. The fire in a 24: 3415: 2850:Sterrett, Frances S., ed. (1995). 2081:(1398): 717–31, discussion 731–2. 2075:Philos Trans R Soc Lond B Biol Sci 1957:10.1111/j.1467-8306.1987.tb00156.x 760: 25: 4390: 3526:–based science tutorial from the 3495: 3241:. Jones & Bartlett Learning. 2952:Lowe, Derek (February 26, 2008). 2191:Scott, AC; Glasspool, IJ (2006). 2069:Wellman, C. H.; Gray, J. (2000). 1582:, water supply resources such as 1520:Prevention and protection systems 1245:also produces a flame, producing 708:Incendiary bombs were dropped by 388:, permitting the accumulation of 3917: 3906: 3896: 3895: 3218:Office of the Fire Commissioner 3212:Fire & Life Safety Education 3190:. SmokeyBear.com. Archived from 2839:from the original on 2020-09-04. 2817:Guillaume, Marine (2016-12-01). 2798:from the original on 27 May 2024 2500:O'Carroll, Eoin (5 April 2012). 1816:Slower oxidative processes like 1670:The Chemical History of a Candle 1542:An abandoned convent on fire in 1461:) 1,000 °C (1,800 °F). 1304:The glow of a flame is complex. 769: 558: 549: 366: 43: 3595:Control of fire by early humans 3294:from the original on 2021-04-11 3267: 3228: 3205: 3180: 3169:from the original on 2011-07-16 3147: 3120: 3109:from the original on 2014-04-17 3091: 3072: 3053: 3030: 3003: 2991:from the original on 2021-12-11 2983:NASA Johnson (29 August 2008). 2976: 2954:"Sand Won't Save You This Time" 2945: 2888: 2868: 2843: 2810: 2760:from the original on 2024-05-27 2742: 2726:In Pictures: German destruction 2718: 2707:from the original on 2012-05-26 2678:from the original on 2024-05-27 2649: 2638:from the original on 2024-05-27 2527: 2493: 2446: 2411: 2358: 2304:from the original on 2024-05-27 2051:from the original on 2024-05-27 2022:from the original on 2024-05-27 1997:from the original on 2024-05-27 1912:from the original on 2009-01-24 1681:Control of fire by early humans 1493: 1465: 1441:) 2,200 °C (4,000 °F) 445:Control of fire by early humans 275:and has been used by humans in 54:needs additional citations for 3159:International Forest Fire News 2896:"How electricity is generated" 2662:Advances in Historical Ecology 2033: 2008: 1971: 1936: 1923: 1897: 1871: 1838: 1810: 1384:Typical adiabatic temperatures 1064:. This is commonly called the 322:, which itself comes from the 13: 1: 3037:Spiral flames in microgravity 1798: 1431:2,534 °C (4,600 °F) 1421:2,800 °C (5,100 °F) 1415:3,480 °C (6,300 °F) 1405:4,990 °C (9,000 °F) 1348:micro gravity or zero gravity 667:were used by infantry in the 248:by natural phenomena such as 4318:Potentially hazardous object 3235:Ward, Michael (March 2005). 2432:10.1080/0067270X.2012.756754 2140:10.1016/0031-0182(91)90180-Y 1831: 1470:Fire science is a branch of 1350:, such as an environment in 971: 924:. The turbines then spin an 892:has been used as fuel since 633:. Fire was the basis of all 298: 220:can contribute to increased 197:of the flame and the fire's 7: 3423:Fire : a brief history 2703:. Columbia Climate School. 2660:. In Balée, William (ed.). 2045:Online Etymology Dictionary 1882:. About.com. Archived from 1651: 1390:Adiabatic flame temperature 1136:application of an inert gas 1017:. This process, known as a 942:internal combustion engines 898:International Energy Agency 682:, were deployed during the 453:Bushman starting a fire in 10: 4395: 3309: 2781:Peace and Conflict Studies 2592:"Fire in the Earth system" 2365:Gowlett, J. A. J. (2016). 2258:"Fire in the Earth system" 1526:Wildfire § Prevention 1523: 1497: 1387: 1179: 1173: 975: 740:; in the latter two cases 507:Here, food is cooked in a 442: 370: 361: 29: 4310: 4273: 4232: 4214: 4183: 4176: 4144: 4110: 4103: 4081: 4051: 4017: 3984: 3975: 3890: 3827: 3806: 3780: 3752: 3731: 3705: 3669: 3613: 3585: 3477:California: A Fire Survey 3326:. Texas State University. 3222:December 6, 2008, at the 2876:World Energy Outlook 2022 2656:Pyne, Stephen J. (1998). 2467:10.1038/nature.2012.10372 1904:Helmenstine, Anne Marie. 1878:Helmenstine, Anne Marie. 1265:. Hydrogen and hydrazine/ 868:Productive use for energy 843:, and others, are highly 645:to attack ships and men. 422:; this kindling provided 3819:The Combustion Institute 3577: 3079:LSP-1 experiment results 3060:CFM-1 experiment results 2826:The Asia-Pacific Journal 2750:"Flamethrower in action" 1803: 1691:Fire (classical element) 1376:, especially concerning 1213:of which depends on the 1169: 878:coal-fired power station 569:The Great Fire of London 271:Fire is one of the four 3165:: 80–81. January 1998. 2616:10.1126/science.1163886 2553:10.1073/pnas.1117620109 2282:10.1126/science.1163886 2218:10.1073/pnas.0604090103 1611:passive fire protection 1312:emission by de-excited 1229:solid particles called 474: million years ago 405: million years ago 386: million years ago 354: 335: 328: 318: 179:, and various reaction 3661:Spontaneous combustion 3330:Karki, Sameer (2002). 2386:10.1098/rstb.2015.0164 2087:10.1098/rstb.2000.0612 1615:active fire protection 1546: 1335: 1301: 1198: 1114: 998: 881: 516: 457: 149: 3511:What exactly is fire? 2854:. Boca Raton: Lewis. 2784:. SAGE. p. 365. 2453:Kaplan, Matt (2012). 1756:List of light sources 1625:, combustibility and 1541: 1330: 1298:Northwest Territories 1291: 1189: 1109: 985: 875: 635:early thermal weapons 506: 452: 434:Human control of fire 373:Fossil record of fire 222:soil erosion by water 214:protective vegetation 144: 32:Fire (disambiguation) 3346:on February 25, 2009 3099:"Flame temperatures" 2999:– via YouTube. 1306:Black-body radiation 1215:chemical composition 1099:is small when it is 1031:chlorine trifluoride 793:improve this section 663:The earliest modern 652:in China led to the 613:, which then drives 521:Neolithic Revolution 236:which remain in the 167:chemical process of 63:improve this article 30:For other uses, see 4374:Terrestrial plasmas 3315:Haung, Kai (2009). 2608:2009Sci...324..481B 2546:(20): E1215–E1220. 2336:1997Palai..12..380R 2274:2009Sci...324..481B 2209:2006PNAS..10310861S 2167:2004Geo....32..381G 2132:1991PPP....97...39J 1235:continuous spectrum 1040:Fires start when a 1019:combustion reaction 967:Physical properties 625:The use of fire in 587:internal combustion 541:Later human control 439:Early human control 324:Proto-Indo-European 201:will be different. 159:of a material (the 4379:Cooking techniques 3969:list by death toll 3322:2012-03-08 at the 3188:"Prescribed Fires" 3084:2007-03-12 at the 3065:2007-09-12 at the 3042:2010-03-19 at the 2881:2022-10-27 at the 2731:2019-12-13 at the 2379:(1696): 20150164. 1983:The New York Times 1886:on 24 January 2009 1706:Fire lookout tower 1696:Fire investigation 1547: 1484:fire investigation 1336: 1302: 1263:nitrogen tetroxide 1211:frequency spectrum 1199: 1115: 1033:is able to ignite 999: 926:electric generator 882: 621:Use of fire in war 517: 458: 273:classical elements 150: 4356: 4355: 4333:Geomagnetic storm 4306: 4305: 4172: 4171: 4099: 4098: 4043:Soil liquefaction 3965:Natural disasters 3931: 3930: 3840:List of wildfires 3515:The Straight Dope 3475:Pyne, Stephen J. 3468:Pyne, Stephen J. 3458:Pyne, Stephen J. 3448:Pyne, Stephen J. 3438:Pyne, Stephen J. 3428:Pyne, Stephen J. 3421:Pyne, Stephen J. 2874:(October 2022), " 2861:978-0-87371-978-0 2791:978-1-4129-6120-2 2754:nzhistory.govt.nz 1761:Phlogiston theory 1659:Aodh (given name) 1562:Wildland fire use 1551:wildland fire use 1247:hydrogen chloride 934:thermal expansion 858:military scouting 829: 828: 821: 684:Spanish Civil War 680:Molotov cocktails 648:The invention of 428:positive feedback 420:million years ago 379:Middle Ordovician 244:and converted to 139: 138: 131: 113: 16:(Redirected from 4386: 4265:Tropical cyclone 4259:Tornado outbreak 4181: 4180: 4108: 4107: 4061:Pyroclastic flow 4053:Volcano eruption 3982: 3981: 3958: 3951: 3944: 3935: 3934: 3921: 3910: 3909: 3899: 3898: 3744:Death by burning 3706:Individual fires 3572: 3565: 3558: 3549: 3548: 3411: 3409: 3408: 3399:. 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3581: 3576: 3498: 3418: 3416:Further reading 3406: 3404: 3389:10.1071/WF05097 3383:(15): 319–345. 3349: 3347: 3343: 3336: 3324:Wayback Machine 3312: 3307: 3306: 3297: 3295: 3288: 3272: 3268: 3258: 3256: 3249: 3233: 3229: 3224:Wayback Machine 3210: 3206: 3197: 3195: 3186: 3185: 3181: 3172: 3170: 3153: 3152: 3148: 3140: 3136: 3125: 3121: 3112: 3110: 3097: 3096: 3092: 3086:Wayback Machine 3077: 3073: 3067:Wayback Machine 3058: 3054: 3044:Wayback Machine 3035: 3031: 3021: 3019: 3008: 3004: 2994: 2992: 2981: 2977: 2967: 2965: 2950: 2946: 2936: 2934: 2923:"What is fire?" 2921: 2920: 2913: 2904: 2902: 2894: 2893: 2889: 2883:Wayback Machine 2873: 2869: 2862: 2848: 2844: 2836: 2821: 2815: 2811: 2801: 2799: 2792: 2776: 2772: 2763: 2761: 2748: 2747: 2743: 2733:Wayback Machine 2723: 2719: 2710: 2708: 2697: 2690: 2681: 2679: 2672: 2654: 2650: 2641: 2639: 2588: 2579: 2532: 2528: 2515: 2513: 2498: 2494: 2484: 2482: 2451: 2447: 2416: 2412: 2363: 2359: 2344:10.2307/3515337 2320: 2316: 2307: 2305: 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