spark (fire)

File:Sparkler.JPG.]]

In pyrotechnics, charcoal, iron filings, aluminum, titanium and metal alloys such as magnalium may be used to create sparks.{{citation |url=https://books.google.com/books?id=e4GOAIA8HaEC&pg=PA49 |title=Pyrotechnic Spark Generation |author1=Kenneth L. Kosanke |author2=Bonnie J. Kosanke |pages=49–62 |journal=Journal of Pyrotechnics |isbn=978-1-889526-12-6 |year=1999 }} The quantity and style of sparks produced depends on the composition and pyrophoricity of the metal and can be used to identify the type of metal by spark testing. In the case of iron, the presence of carbon is required, as in carbon steel — about 0.7% is best for large sparks. The carbon burns explosively in the hot iron and this produces pretty, branching sparks.{{citation |url=https://books.google.com/books?id=Q1yJNr92-YcC&pg=RA4-PA25 |title=Pyrotechnic Chemistry |year=2004 |isbn=9781889526157 |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=Q1yJNr92-YcC&pg=RA4-PA25 |archive-date=2017-12-16 |last1=Kosanke |first1=Kenneth |publisher=Journal of Pyrotechnics, Incorporated }} The color of sparks used in pyrotechnics is determined by the material that the sparks are made from, with the possibility of adding different chemical compounds to certain materials to further influence the color of the sparks. The basic color of sparks is limited to red/orange, gold (yellow) and silver (white). This is explained by light emission from a solid particle. Light emitted from solid particles is defined by black-body radiation. The temperature of the spark is controlled by the reactivity of the metal. Higher reactive metals lead to hotter sparks. The electronegativity has found to be a helpful indicator to estimate the temperature and consequently the color of a spark. To achieve colors differing from black body emitters, vapor phase combustion of the metal is necessary. A typical example is zinc, with a relatively low boiling point of {{convert|1180 |K}}. Zinc sparks show an unusual bluish/greenish white appearance. Exotic sparks can be obtained from erbium powder. These sparks switch between surface and vapor phase combustion and accordingly between orange (black body) and green (element specific) emission.{{cite journal |last1=Lederle |first1=Felix |last2=Koch |first2=Jannis |last3=Hübner |first3=Eike G. |title=Colored Sparks |journal=European Journal of Inorganic Chemistry |date=21 February 2019 |volume=2019 |issue=7 |pages=928–937 |doi=10.1002/ejic.201801300|s2cid=104449284 }} The color-change is based on the medium-ranged boiling point of erbium, which burns only partly in the vapor phase. File:erbium_sparks.jpg The adjacent rare earth elements thulium, lutetium and yttrium can form color-changing sparks, too, although the visibility of both phases of the same spark is less pronounced due to a lower (Tm) or higher (Y, Lu) boiling point of the metal.{{cite journal |last1=Lederle |first1=Felix |last2=Koch |first2=Jannis |last3=Schade |first3=Wolfgang |last4=Hübner |first4=Eike G. |title=Color-Changing Sparks from Rare Earth Metal Powders |journal=Zeitschrift für anorganische und allgemeine Chemie |date=31 January 2020 |volume=646 |issue=2 |pages=37–46 |doi=10.1002/zaac.201900300 |doi-access=free }} Alloys containing at least one metal with a low boiling point can be used to control the color of the spark.{{cite journal |last1=Memmel |first1=Philipp |last2=Lederle |first2=Felix |last3=Söftje |first3=Martin |last4=Koch |first4=Jannis |last5=Li |first5=Mingji |last6=Schade |first6=Wolfgang |last7=Hübner |first7=Eike G. |title=Customizing the Appearance of Sparks with Binary Metal Alloys |journal=ACS Omega |date=2022 |volume=7 |issue=32 |pages=28408–28420 |doi=10.1021/acsomega.2c03081 |pmid=35990440 |pmc=9386707 }} The lower boiling component evaporates and burns in the vapor phase, while the metal with a high boiling point serves as a carrier. In the vapor phase, bright element-specific light emission takes place. For example, a eutectic ytterbium-copper-alloy forms long green sparks and burning lithium silicide shows long red spark segments. The duration of a spark’s existence is determined by the initial size of the particle, with a larger size leading to a longer-lasting spark.

Metals with low thermal conductivity are especially good at producing sparks. Titanium and zirconium are especially good in this respect and so are now used in fireworks. Copper, on the other hand, has a high conductivity and so is poor at producing sparks. For this reason, alloys of copper such as beryllium bronze are used to make safety tools which will not spark so easily.{{citation |url=https://books.google.com/books?id=aff7sEea39EC&pg=PA371 |title=Encyclopedia of the elements |author=Per Enghag |page=371 |publisher=John Wiley and Sons |year=2004 |isbn=978-3-527-30666-4 |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=aff7sEea39EC&pg=PA371 |archive-date=2017-12-16 }}

File:Hooke's sparks.PNG

Robert Hooke studied the sparks created by striking a piece of flint and steel together. He found that the sparks were usually particles of the steel that had become red hot and so melted into globules.{{citation |url=https://books.google.com/books?id=agq2TAx91ZoC&pg=PA5 |title=Microscopic observations |author=Robert Hooke |year=1780 |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=agq2TAx91ZoC&pg=PA5 |archive-date=2017-12-16 |author-link=Robert Hooke }} These sparks can be used to ignite tinder and so start a fire.{{citation |url=https://books.google.com/books?id=f5oDAAAAYAAJ&pg=PA196 |title=An encyclopædia of domestic economy |author1=Thomas Webster |author2=Mrs. William Parkes |year=1855 |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=f5oDAAAAYAAJ&pg=PA196 |archive-date=2017-12-16 }}

In colonial America, flint and steel were used to light fires when easier methods failed. Scorched linen was commonly used as tinder to catch the spark and start the fire, but producing a good spark could take much time. A spinning steel wheel provided a good stream of sparks when it engaged the flint, and a tinderbox designed to do this was known as a mill.{{citation |url=https://books.google.com/books?id=s7eIZotqrWIC&pg=PA22 |title=Home Life in Colonial Days |author=Alice Morse Earle |date=July 2009 |pages=22–23 |publisher=Echo Library |isbn=978-1-4068-5143-4 |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=s7eIZotqrWIC&pg=PA22 |archive-date=2017-12-16 }}

In a modern lighter or firesteel, iron is mixed with cerium and other rare earths to form the alloy ferrocerium. This readily produces sparks when scraped and burns hotter than steel would. This higher temperature is needed to ignite the vapour of the lighter fluid.{{citation |title=Fire: Servant, Scourge, and Enigma |author=Hazel Rossotti |page=24 |isbn=978-0-486-42261-9 |publisher=Courier Dover Publications |year=2002|author-link=Hazel Rossotti }}

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File:Bessemer converter (iron into steel), Allegheny Ludlum Steee Corp., Brackenridge, Pa.jpg

Molten metal sparks can be created when metal is heated by processes such as Bessemer conversion of iron to steel or arc welding.

File:Robotworx-spot-welding-robot.jpg

Arc welding uses a low voltage and high current electric arc between an electrode and the base material to melt the metals at the welding point, which often creates sparks. To reduce the risk of burns, welders wear heavy leather gloves and long sleeve jackets to avoid exposure to extreme heat, flames, and sparks. In spot welding, metal surfaces that are held in contact are joined by the heat from resistance to electric current flow. It is common for a spray of sparks in the form of molten metal droplets to be ejected from the parts being joined.{{cite book |author=Finch, Richard |title=Welder's Handbook, RevisedHP1513: A Guide to Plasma Cutting, Oxyacetylene, ARC, MIG and TIG Welding |publisher=HP Trade |year=2007 |page=34 |isbn=978-1-55788-513-5 }} or the resistance heating of spot welding.{{cite book |author1=Lawrence Bower |author2=Jeffus, Larry F. |title=Welding Skills, Processes and Practices for Entry-Level Welders: Book 2 |publisher=Delmar Cengage Learning |year=2009 |isbn=978-1-4354-2790-7 }}

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File:Porterturbiini.jpg on a locomotive]]

Fires may produce sparks as updrafts carry particles of the burning fuel aloft. This was a great problem with steam locomotives as the sparks might set fire to the adjacent landscape or even to the train itself, especially if the engine burned wood rather than coal.{{citation |chapter-url=https://books.google.com/books?id=rqxTjwT6h58C&pg=PA29 |title=American steam locomotive |author=Brian Solomon |chapter=Wood burners |page=29 |isbn=978-0-7603-0336-8 |year=1998 |publisher=MBI Publishing Company |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=rqxTjwT6h58C&pg=PA29 |archive-date=2017-12-16 }} To prevent this dangerous nuisance, a variety of spark arrestors were invented and fitted.{{citation |chapter-url=https://books.google.com/books?id=1A4iiGAz628C&pg=PA114 |title=A history of the American locomotive |author=John H. White |chapter=Smokestacks and spark arrestors |year=1980 |isbn=978-0-486-23818-0 |publisher=Courier Dover Publications |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=1A4iiGAz628C&pg=PA114 |archive-date=2017-12-16 }}

The chimneys and exhausts of other fuel-burning engines such as steam engines or internal combustion engines might also have spark arrestors fitted if there would be a fire risk from their operation. For example, a trail bike might be fitted with a centrifugal arrestor, which will trap glowing hot pieces of soot.{{citation |url=https://books.google.com/books?id=ozV8-Aer4N8C&pg=PA101 |title=Clymer Yamaha Pw50 Y-Zinger, Pw80 Y-Zinger & Bw80 Big Wheel, 1981-2002 |author=Sally F Cutler |date=2000-05-24 |page=101|publisher=Pearson Deutschland GmbH |isbn=9780892878284 }}

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File:Creation-of-adam.PNG by Michelangelo in which the spark of life is passed]]

The significance of a spark as a source for a flame or a conflagration shows clearly, for example, in the naming and motto of Lenin's newspaper Iskra [The Spark]. The spark metaphor has often been used in philosophy since Stoicism{{cite book|last=Cline Horowitz|first=Maryanne|title=Seeds of Virtue and Knowledge|publisher=Princeton University Press|year=1998}} and, recently, after Jacques Lacan. The “creative spark” has come to be considered as inherent to metaphor itself.{{cite book|last=Bennington|first=Geoffrey|title=Lyotard: Writing the Event|publisher=Manchester University Press|year=1988|isbn=978-0-7190-2288-3|page=82}} Hasidic philosophy contains a doctrine of holy sparks (nitzotzot) from the kabbalism of Isaac Luria in which there is a duty to gather the sundered light of creation.{{citation |chapter-url=https://books.google.com/books?id=l1u-_VMDM80C&pg=PA249 |title=The Jewish religion |author=Louis Jacobs |chapter=Holy Sparks |pages=249–251 |publisher=Oxford University Press |isbn=978-0-19-826463-7 |year=1995 |url-status=live |archive-url=https://web.archive.org/web/20161123123951/https://books.google.com/books?id=l1u-_VMDM80C |archive-date=2016-11-23 }}

In the Book of Job (Job 5:7), it is written, "Yet man is born unto trouble, as the sparks fly upward." The use by King James' translators of the word sparks here is a poetic one rather than a literal one.{{citation |url=https://books.google.com/books?id=q6MCAAAAQAAJ&pg=PA81 |title=A commentary, grammatical and exegetical, on the book of Job |author=Andrew Bruce Davidson |year=1862 |url-status=live |archive-url=https://web.archive.org/web/20171216222210/https://books.google.com/books?id=q6MCAAAAQAAJ&pg=PA81 |archive-date=2017-12-16 }} The sparks of fire are identified by some translators as the sons of Resheph - a Canaanite deity of lightning and pestilence.{{citation |url=https://books.google.com/books?id=N9F1hkMuN0gC&pg=PA132 |title=The Book of Job: A Commentary |author=Norman C. Habel |isbn=978-0-664-22218-5 |year=1985|publisher=Westminster John Knox Press |author-link=Norman C. Habel }}

{{Portal|Chemistry|Physics|Energy}}

• Electric arc
• Lightning
• Short circuit
• Ember

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Category:Fire