You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.to share – to copy, distribute and transmit the work.This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. GFDL GNU Free Documentation License true true A copy of the license is included in the section entitled GNU Free Documentation License. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. In this gallery "Fire" we have 54 free PNG images with transparent background.SirVir at Polish Wikipedia, the copyright holder of this work, hereby publishes it under the following licenses: In this gallery you can download free PNG images: Fire PNG images free download, flame fire PNG image This loss of nitrogen caused by a fire 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.įire 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. 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. If fire removes protective vegetation, heavy rainfall may lead to an increase in soil erosion by water. The negative effects of fire include hazard to life and property, atmospheric pollution, and water contamination. The positive effects of fire include stimulating growth and maintaining various ecological systems. Fire is an important process that affects ecological systems around the globe. Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity will be different.įire in its most common form can result in conflagration, which has the potential to cause physical damage through burning. ![]() If hot enough, the gases may become ionized to produce plasma. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. The flame is the visible portion of the fire. At a certain point in the combustion reaction, called the ignition point, flames are produced. Slower oxidative processes like rusting or digestion are not included by this definition.įire 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 (418 kJ per 32 g of O2) the bond energies of the fuel play only a minor role here. Fire is the rapid oxidation of a material in the exothermic chemical process of combustion, releasing heat, light, and various reaction products.
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