Fire is the rapid oxidation of a fuel in the exothermic chemical process of combustion, releasing heat, light, and various reaction products.
Flames, the most visible portion of the fire, are produced in the combustion reaction when the fuel reaches its ignition point. Flames from hydrocarbon fuels consist primarily of carbon dioxide, water vapor, oxygen, and nitrogen. If hot enough, the gases may become ionized to produce plasma. The color and intensity of the flame depend on the type of fuel and composition of the surrounding gases.
Fire, in its most common form, has the potential to result in conflagration, which can lead to permanent physical damage. It directly impacts land-based ecological systems worldwide. The positive effects of fire include stimulating plant growth and maintaining ecological balance. Its negative effects include hazards to life and property, atmospheric pollution, and water contamination. When fire removes protective vegetation, heavy rainfall can cause soil erosion. The burning of vegetation releases nitrogen into the atmosphere, unlike other plant nutrients such as potassium and phosphorus which remain in the ash and are quickly recycled into the soil. This loss of nitrogen produces a long-term reduction in the fertility of the soil, though it can be recovered by nitrogen-fixing plants such as clover, peas, and beans; by decomposition of animal waste and corpses, and by natural phenomena such as lightning.
Fire is one of the four classical elements and 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. Various technologies and strategies have been devised to prevent, manage, mitigate, and extinguish fires, with professional firefighters playing a leading role.
Redondo (Spanish and Portuguese for "rotund" or "round") may refer to:
Table may refer to:
- Table (database), how the table data arrangement is used within the databases
- Table (furniture), a piece of furniture with a flat surface and one or more legs
- Table (information), a data arrangement with rows and columns
- Table (landform), a flat area of land
- Table (parliamentary procedure)
- Table (sports), a ranking of the teams in a sports league
- Tables (board game)
- Mathematical table
- Tables of the skull, a term for the flat bones
- Table, surface of the sound board (music) of a string instrument
- Al-Ma'ida, the fifth surah of the Qur'an, occasionally translated as “The Table”
- Calligra Tables, a spreadsheet application
- Water table
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