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更新日期：2019-06-14
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Email：https://docs.google.com/document/d/15lmNtMf_dnkFM-aUjovAQXcNvUCa20YtS_cjiklGIEo/edit
Fire is the rapid oxidation of a material in the exothermic chemical process of combustion releasing heat light and various reaction products. Slower oxidative processes like rusting or digestion are not included by this definition.
Fire is hot because conversion of the weak double bond in molecular oxygen O2 to the stronger bonds in the combustion products carbon dioxide and water releases energy the bond energies of the fuel play only a minor role here. At a certain point in the combustion reaction called the ignition point flames are produced. The flame is the visible portion. Flames consist primarily of carbon dioxide water vapor oxygen and nitrogen. If hot enough the gases may become ionized to produce plasma. Depending on the substances alight and any impurities outside the color of the flame and the fire's intensity will be different.
Fire in its most common form can result in conflagration which has the potential to cause physical damage through burning. Fire is an important process that affects ecological systems around the globe. The positive effects of fire include stimulating growth and maintaining various ecological systems.
The negative effects of hazard to life and property atmospheric pollution and water contamination. If fire removes protective vegetation heavy rainfall may lead to an increase in soil erosion by water. Also when vegetation is burned the nitrogen it contains is released into the atmosphere unlike elements such as potassium and phosphorus which remain in the ash and are quickly recycled into the soil. This loss of nitrogen caused by produces a long-term reduction in the fertility of the soil which only slowly recovers as nitrogen is fixed from the atmosphere by lightning and by leguminous plants such as clover.
Fire has been used by humans in rituals in agriculture for clearing land for cooking generating heat and light for signaling propulsion purposes smelting forging incineration of waste cremation and as a weapon or mode of destruction.
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