Changes

==Etymology==

==Etymology==

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Old English fȳr; akin to Old High German fiur fire, Greek pyr

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Old English fȳr; akin to Old High German fiur fire, Greek pyr

*Date: before [http://www.wikipedia.org/wiki/12th_Century 12th century]

*Date: before [https://www.wikipedia.org/wiki/12th_Century 12th century]

==Definitions==

==Definitions==

*1 a (1) : the [[phenomenon]] of combustion [[manifested]] in [[light]], flame, and [[heat]] (2) : one of the four elements of the alchemists  

*1 a (1) : the [[phenomenon]] of combustion [[manifested]] in [[light]], flame, and [[heat]] (2) : one of the four elements of the alchemists  

:c : a rapidly delivered series (as of remarks)

:c : a rapidly delivered series (as of remarks)

==Description==

==Description==

'''Fire''' is the rapid oxidation of a [[material]] in the [[chemical]] [[process]] of [http://en.wikipedia.org/wiki/Combustion combustion], releasing [[heat]], [[light]], and various [[reaction]] products. Slower oxidative [[processes]] like rusting or digestion  are not included by this definition.

'''Fire''' is the rapid oxidation of a [[material]] in the [[chemical]] [[process]] of [https://en.wikipedia.org/wiki/Combustion combustion], releasing [[heat]], [[light]], and various [[reaction]] products. Slower oxidative [[processes]] like rusting or digestion  are not included by this definition.

The [http://en.wikipedia.org/wiki/Flame flame] is the [[visible]] portion of the fire and consists of [[glowing]] hot [[gases]]. If hot enough, the gases may become ionized to produce [http://en.wikipedia.org/wiki/Plasma_(physics) plasma]. Depending on the substances alight, and any impurities outside, the [[color]] of the flame and the fire's [[intensity]] might vary.

The [https://en.wikipedia.org/wiki/Flame flame] is the [[visible]] portion of the fire and consists of [[glowing]] hot [[gases]]. If hot enough, the gases may become ionized to produce [https://en.wikipedia.org/wiki/Plasma_(physics) plasma]. Depending on the substances alight, and any impurities outside, the [[color]] of the flame and the fire's [[intensity]] might vary.

Fire in its most common [[form]] can result in [http://en.wikipedia.org/wiki/Conflagration conflagration], which has the [[potential]] to [[cause]] [[physical]] damage through burning. Fire is an important [[process]] that affects [[ecological]] [[systems]] across the globe. The positive [[effects]] of fire include stimulating [[growth]] and maintaining various [[ecological]] [[systems]]. Fire has been used by [[humans]] for cooking, generating [[heat]], signaling, and propulsion purposes. The [[negative]] effects of fire include decreased [[water]] purity, increased [[soil]] erosion, an increase in [[atmospheric]] pollutants and an increased hazard to human life.[http://en.wikipedia.org/wiki/Fire]

Fire in its most common [[form]] can result in [https://en.wikipedia.org/wiki/Conflagration conflagration], which has the [[potential]] to [[cause]] [[physical]] damage through burning. Fire is an important [[process]] that affects [[ecological]] [[systems]] across the globe. The positive [[effects]] of fire include stimulating [[growth]] and maintaining various [[ecological]] [[systems]]. Fire has been used by [[humans]] for cooking, generating [[heat]], signaling, and propulsion purposes. The [[negative]] effects of fire include decreased [[water]] purity, increased [[soil]] erosion, an increase in [[atmospheric]] pollutants and an increased hazard to human life.[https://en.wikipedia.org/wiki/Fire]

[[Category: Chemistry]]

[[Category: Chemistry]]