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[[File:FIRE 01.JPG|thumb|200px|火]]
凡物[[氧化]]至劇,光熱並生,即'''火'''也。古人不明化學,遂列元素,中土華[[五行]]、天竺泰西[[四大元素說]]皆所謂也如是。
華夏神話以[[燧人氏]]鑽[[木]]取火;[[古希臘|希臘]]以[[普羅米修斯]]盜火。初人先民以火,得離腥膻以達文明之徑也。
今人觀之當世究知,實火為[[電漿]],云物質第四態也<ref>{{cite web | url = http://chemistry.about.com/od/chemistryfaqs/f/firechemistry.htm | title = What is the State of Matter of Fire or Flame? Is it a Liquid, Solid, or Gas? | publisher = About.com | accessdate = 2009-01-21 | last = Helmenstine | first = Anne Marie | postscript = <!--None-->}}</ref>。又焚物諸類,各有既異,火色明光暗亦異也。
欲生火之先,須有備[[可燃物|可燃之物料]]、高溫、[[氧化劑]]並化物四者,缺一不可<ref>{{cite web|url=http://202.206.208.57/baoweichu/show_news.asp?id=257&types=10 |title=從本質上了解燃燒的形成 |publisher=202.206.208.57 |date= |accessdate=2014-04-25}}</ref>,據[[質量守恆律]],所焚之物不泯,蓋行[[化學反應|效]]為[[分子]]矣。
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