Fire is the rapid oxidation of a material (the fuel) in the exothermic chemical process of combustion, releasing heat, light, and various reaction products.
Fire is hot because the conversion of the weak double bond in molecular oxygen, O2, to the stronger bonds in the combustion products carbon dioxide and water releases energy (418 kJ per 32 g of O2); 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 of the fire. 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.
Its negative effects include 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 a fire produces a long-term reduction in the fertility of the soil, but this fecundity can potentially be recovered as molecular nitrogen in the atmosphere is "fixed" and converted to ammonia by natural phenomena such as lightning and by leguminous plants that are "nitrogen-fixing" such as clover, peas, and green beans.
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.
Martin Luther King alikua Mmarekani mwenye asili ya Afrika, msomi aliyepigania haki hasa za weusi, baada ya utumwa kukomeshwa wabantu waliochukuliwa utumwani hawakupewa haki sawa na Wazungu.
Aliuliwa miezi saba baada ya kupigwa picha hii. Roho yake ipumzike kwa Amani.
Ali Landi, an Iranian teenager who became a national hero after rescuing two women from fire, has passed away due to severe burns.
Earlier this month, Ali, a 15-year-old boy from Izeh city in Khuzestan Province, rushed to rescue two neighboring women trapped in a burning house.
After the...
A fire broke out early Wednesday morning in a prison in Tangerang, a town west of the Indonesian capital. "Forty-one inmates have died, eight have been seriously injured and 72 have minor injuries," Jakarta Police Chief Fadil Imran told reporters.
Television footage showed fire department...
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