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Fire
Rapid oxidation of a material

Fire is the rapid oxidation of a fuel through combustion, releasing heat, light, and reaction products. Its visible flames appear once fuel reaches the ignition point, with characteristics depending on the fuel type, sometimes producing plasma. Fire impacts ecosystems by causing conflagrations that may lead to soil erosion but also stimulate plant growth. While nitrogen is lost to the atmosphere, nutrients like potassium and phosphorus return to the soil via ash. Historically, fire, one of the classical elements, has been essential for cooking, smelting, and rituals, while fire prevention and control rely on strategies and professional firefighters.

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Etymology

The word fire comes from Old English fȳr and has cognates in many Germanic languages and other Indo-European languages.9 The Proto-Germanic nominative form is reconstructed as *fōr, descending from Proto-Indo-European *péh2wr.10 An alternative spelling existed in Middle English: fier; still preserved in fiery.11

History

Fossil record

Main article: Fossil record of fire

The fossil record of fire first appears with the establishment of a land-based flora in the Middle Ordovician period, 470 million years ago.12 These land plants contributed large amounts of oxygen to the atmosphere when they released it as a waste product. When this concentration rose above 13%, it permitted the possibility of wildfire.13 Wildfire is first recorded in the Late Silurian fossil record, 420 million years ago, by fossils of charred plants.1415 Apart from a controversial gap in the Late Devonian, charcoal is present ever since.16 The level of atmospheric oxygen is closely correlated with the amount of charcoal in the fossil record, clearly pointing to oxygen as the key factor in the prevalence of wildfire.17 Fire also became more abundant when grasses became the dominant component of many ecosystems, around 6 to 7 million years ago,18 providing excellent tinder for more rapid spread of fire.19 This widespread emergence of wildfire may have initiated a positive feedback process, whereby they produced a warmer, drier climate more conducive to fire.20

Human control

The period of history characterized by the influence of human-caused fire activity on Earth has been dubbed the pyrocene. This epoch includes the burning of fossil fuels, especially for technological uses.21

Early human control

Main article: Control of fire by early humans

The ability to control fire was a dramatic change in the habits of early humans.22 Making fire to generate heat and light made it possible for people to cook food, simultaneously increasing the variety and availability of nutrients and reducing disease by killing pathogenic microorganisms in the food.23 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. Evidence of occasional cooked food is found from 1 million years ago,24 suggesting it was used in a controlled fashion.2526 Other sources put the date of regular use at 400,000 years ago.27 Evidence becomes widespread around 50 to 100 thousand years ago, suggesting regular use from this time; resistance to air pollution started to evolve in human populations at a similar point in time.28 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.29

By the Neolithic Revolution, during the introduction of grain-based agriculture, people all over the world used fire as a tool in landscape management. These fires were typically controlled burns or "cool fires", as opposed to uncontrolled "hot fires", which damage the soil. Hot fires destroy plants and animals, and endanger communities.30 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 generally conducted in the spring and autumn. They clear undergrowth, burning up biomass 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.31

Another human use for fire in regards to landscape management is its use to clear land for 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.32 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.33

Later human control

Throughout much of history, cultures attempted to explain nature and the properties of matter by proposing a set of four (or five) classical elements, of which fire formed one of the components. As scientific understanding developed following the Middle Ages, this philosophy was replaced by a set of chemical elements and their interactions. Instead, the classical elements found an equivalency in the states of matter: solid, liquid, gas, and plasma.34

During the 17th century, a study of combustion was made by Jan Baptist van Helmont who discovered that burning charcoal released a gas sylvestris, or wild spirit.35 This was subsequently incorporated into Phlogiston theory by Johann Joachim Becher in 1667; a concept that would dominate alchemical thinking for nearly two centuries.36 It was Antoine Lavoisier who demonstrated that combustion did not involve the release of a substance, but rather something was being taken up.37 In 1777, Lavoisier proposed a new theory of combustion based on the reaction of a material with a component of air, which he termed oxygène. By 1791, Lavoisier's chemistry concepts had been widely adopted by young scientists, and Phlogiston theory was rejected.38

Fire has been used for centuries as a method of torture and execution,39 as evidenced by death by burning as well as torture devices such as the iron boot,40 which could be heated over an open fire to the agony of the wearer.41

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 internal combustion vehicles employ fire every time they drive. Thermal power stations provide electricity for a large percentage of humanity by igniting fuels such as coal, oil or natural gas, then using the resultant heat to boil water into steam, which then drives turbines.42

Use in war

The use of fire in warfare has a long history. Fire was the basis of all early thermal weapons, including incendiary devices, heated projectiles, and the use of smoke. This class of weapons was particularly evident during naval battles and siege warfare. The Byzantine fleet used Greek fire to attack ships and men.43444546

The invention of gunpowder in China led to the fire lance, a flame-thrower weapon dating to around 1000 CE which was a precursor to projectile weapons driven by burning gunpowder.47 The earliest modern flamethrowers were used by infantry in the First World War, first used by German troops against entrenched French troops near Verdun in February 1915.48 They were later successfully mounted on armoured vehicles in the Second World War.49

Hand-thrown incendiary bombs improvised from glass bottles, later known as Molotov cocktails, were deployed during the Spanish Civil War in the 1930s.50 During that war, incendiary bombs were deployed against Guernica by Fascist Italian and Nazi German air forces that had been created specifically to support Franco's Nationalists.51

Incendiary bombs were dropped by Axis and Allies during the Second World War, notably on Coventry, Tokyo, Rotterdam, London, Hamburg and Dresden. In the latter two cases, firestorms were deliberately caused in which a ring of fire surrounding each city was drawn inward by an updraft created by a central cluster of fires.52 The United States Army Air Force extensively used incendiaries against Japanese targets in the latter months of the war, devastating entire cities constructed primarily of wood and paper houses. The incendiary fluid napalm was used in July 1944, towards the end of the Second World War, although its use did not gain public attention until the Vietnam War.53

Productive use for energy

Burning fuel converts chemical energy into heat energy; wood has been used as fuel since prehistory.54 The International Energy Agency states that nearly 80% of the world's power has consistently come from fossil fuels such as petroleum, natural gas, and coal in the past decades.55 The fire in a power station is used to heat water, creating steam that drives turbines. The turbines then spin an electric generator to produce electricity.56 Fire is also used to provide mechanical work directly by thermal expansion, in both external and internal combustion engines.57

The unburnable solid remains of a combustible material left after a fire is called clinker if its melting point is below the flame temperature, so that it fuses and then solidifies as it cools, and ash if its melting point is above the flame temperature.

Physical properties

Chemistry

Main article: Combustion

Fire is a chemical process in which a fuel and an oxidizing agent react, yielding carbon dioxide and water.58 This process, known as a combustion reaction, does not proceed directly and involves intermediates.59 Although the oxidizing agent is typically oxygen, other compounds are able to fulfill the role. For instance, chlorine trifluoride is able to ignite sand.60

Fires start when a flammable or a combustible material, in combination with a sufficient quantity of an oxidizer such as oxygen gas or another oxygen-rich compound (though non-oxygen oxidizers exist, such as chlorine),61 is exposed to a source of heat or ambient temperature above the flash point for the fuel/oxidizer mix, and is able to sustain a rate of rapid oxidation that produces a chain reaction. This is commonly called the fire tetrahedron.62 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.63 Some fuel-oxygen mixes may require a catalyst, a substance that is not consumed, when added, in any chemical reaction during combustion, but which enables the reactants to combust more readily.64

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.65 If the oxidizer is oxygen from the surrounding air, the presence of a force of gravity,66 or of some similar force caused by acceleration, is necessary to produce convection, 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 extinguish the fire. Because of this, the risk of fire in a spacecraft is small when it is coasting in inertial flight.6768 This does not apply if oxygen is supplied to the fire by some process other than thermal convection.

Fire can be extinguished by removing any one of the elements of the fire tetrahedron.69 Consider a natural gas flame, such as from a stove-top burner. The fire can be extinguished by any of the following:

  • turning off the gas supply, which removes the fuel source;
  • 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 CO2;
  • application of an inert gas such as carbon dioxide, smothering the flame by displacing the available oxidizer;70
  • application of water, which removes heat from the fire faster than the fire can produce it71 (similarly, blowing hard on a flame will displace the heat of the currently burning gas from its fuel source, to the same end); or
  • application of a retardant chemical such as Halon (largely banned in some countries as of 2023[update]) to the flame, which retards the chemical reaction itself until the rate of combustion is too slow to maintain the chain reaction.72

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 stoichiometric proportions,73 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.

Flame

Main article: Flame

See also: Flame test

A diffusion flame is a mixture of reacting gases and solids emitting visible, infrared, and sometimes ultraviolet light, the frequency spectrum of which depends on the chemical composition of the burning material and intermediate reaction products. During the burning of hydrocarbons, for example wood, or the incomplete combustion of gas, incandescent solid particles called soot produce the familiar red-orange glow of "fire".7475 This light has a continuous spectrum. Complete combustion of gas has a dim blue color76 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 hydrogen burning in chlorine also produces a flame, producing hydrogen chloride (HCl).77 Other possible combinations producing flames, amongst many, are fluorine with hydrogen,78 and hydrazine with dinitrogen tetroxide.79 Hydrogen and hydrazine/UDMH flames are similarly pale blue, while burning boron and its compounds, evaluated in mid-20th century as a high energy fuel for jet and rocket engines, emits intense green flame, leading to its informal nickname of "Green Dragon".80

The glow of a flame is complex. Black-body radiation is emitted from soot, gas, and fuel particles, though the soot particles are too small to behave like perfect blackbodies. There is also photon emission by de-excited atoms and molecules 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 emission spectra.81

The common distribution of a flame under normal gravity conditions depends on convection, as soot tends to rise to the top of a general flame, as in a candle in normal gravity conditions, making it yellow. In microgravity or zero gravity,82 such as an environment in outer space, convection no longer occurs, and the flame becomes spherical, with a tendency to become more blue and more efficient (although it may go out if not moved steadily, as the CO2 from combustion does not disperse as readily in microgravity, 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.83

Experiments by NASA reveal that diffusion flames in microgravity 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.84 These discoveries have potential applications in applied science and industry, especially concerning fuel efficiency.

Typical adiabatic temperatures

Main article: Adiabatic flame temperature

The adiabatic flame temperature of a given fuel and oxidizer pair is that at which the gases achieve stable combustion.

Fire science

Fire science is a branch of physical science which includes fire behavior, dynamics, and combustion. Applications of fire science include fire protection, fire investigation, and wildfire management.

Ecology

Main article: Fire ecology

Every natural ecosystem on land has its own fire regime, and the organisms in those ecosystems are adapted to or dependent upon that fire regime. Fire creates a mosaic of different habitat patches, each at a different stage of succession.92 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.93

Firefighting

Main articles: Firefighting, Aerial firefighting, and Wildfire suppression

Fire fighting services are provided in most developed areas to extinguish or contain uncontrolled fires. Trained firefighters use fire apparatus, water supply resources such as water mains and fire hydrants or they might use A and B class foam depending on what is feeding the fire.9495

The early detection of a wildfire outbreak can be performed by a fire lookout observing from a tower constructed for that purpose. The use of these towers peaked in 1938 and has been in decline since that time; most of the fire surveillance work is now performed using infrared sensors and aircraft.96 Fire suppression aircraft guided by a lookout can be used to help manage wildfires. These are primarily used in support of ground crews97

Management, prevention and protection systems

Main articles: Wildfire § Prevention, Fire prevention, Fire protection, and Fire safety

Controlling a fire to optimize its size, shape, and intensity is generally called fire management, and the more advanced forms of it, as traditionally (and sometimes still) practiced by skilled cooks, blacksmiths, ironmasters, and others, are highly skilled 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, or modify stoves, fireplaces, bakery ovens, or industrial furnaces; and so on. Detailed expositions of fire management are available in various books about blacksmithing, about skilled camping or military scouting, and about domestic arts.9899100

Wildfire prevention programs around the world may employ techniques such as wildland fire use and prescribed or controlled burns.101 Wildland fire use refers to any fire of natural causes that is monitored but allowed to burn. Controlled burns are fires ignited by government agencies under less dangerous weather conditions.102

Fire prevention is intended to reduce sources of ignition. Fire prevention also includes education to teach people how to avoid causing fires.103 Buildings, especially schools and tall buildings, often conduct fire drills to inform and prepare citizens on how to react to a building fire. Purposely starting destructive fires constitutes arson and is a crime in most jurisdictions.104

Model building codes require passive fire protection and active fire protection systems to minimize damage resulting from a fire. A common form of active fire protection is fire sprinklers.105 To maximize passive fire protection of buildings, building materials and furnishings in most developed countries are tested for fire-resistance, combustibility and flammability. Upholstery, carpeting and plastics used in vehicles and vessels are also tested.

Where fire prevention and fire protection have failed to prevent damage, fire insurance can mitigate the financial impact.106

In culture

Fire has been an importance element of human culture since the Lower Paleolithic.107 Archaeological evidence demonstrates that fire worship has been widely practiced since prehistory, with dedicated structures found dating from at least the Chalcolithic period. Zoroastrianism originated from this practice.108 In some societies fire was a deity, while others viewed it as the manifestation of the divine.109 The fire in a hearth was perceived as symbolic of the Heavenly Fire, and thus is considered a sacred component by fire worshipping cultures.110 The origin of fire became a subject of mythology. In ancient Greek culture, the Titan–god Prometheus was responsible for stealing heavenly fire and gifting it to humanity.111

The use of a pyre as a funerary practice dates back to at least the Ancient Roman period in the West,112 and to about 4,000 years ago on the Indian subcontinent.113 Cremation of corpses is a tradition long practiced in some cultures, including Hindu. After early religious resistance in some countries, in the 19th century this practice became more widespread and is now commonplace.114 In some nations, suicide by self-immolation remains common.115

The symbology of fire remains important to the present day. Where wood is plentiful, the bonfire can be used for celebration purposes, in many cases as part of a tradition. An example is Guy Fawkes Night in England.116 The barbecue is a fire-based cultural tradition in the United States.117 The fiery ignition of fireworks has become a modern tradition to celebrate the New Years arrival.118 In contrast, book burning has been used as a form of protest, whether for political, religious, or moral reasons.119 The act of "burning in effigy" has a similar role, as in the annual burning of Judas ritual.120

Humans lack an instinctual fascination with fire, yet in modern societies adults can become drawn to it out of curiosity. In societies that are dependent on daily fire use, children lose interest in fire at about age seven due to regular exposure.121 Arson is the act of intentionally setting fire to a property. A separate but related behavior is pyromania, which is classified as an impulse-control disorder where individuals repeatedly fail to resist impulses to deliberately start fires.122 In contrast is pyrophobia, an irrational fear of fire. This anxiety disorder is a less common phobia.123

See also

Notes

Citations

Further reading

Wikimedia Commons has media related to Fire. Wikiquote has quotations related to Fire.

References

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  2. Slower oxidative processes like rusting or digestion are not included by this definition. /wiki/Rusting ↩

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