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Oct 7, 2024 · Fire, rapid burning of combustible material with the evolution of heat and usually accompanied by flame. It is one of the human race’s essential tools, control of which helped start it on the path toward civilization. The original source of fire undoubtedly was lightning, and such fortuitously
- The Editors of Encyclopaedia Britannica
- Fire is a rapid burning of combustible material in the presence of oxygen manifested as flames. It is usually accompanied by heat and light. Fire i...
- Evidence suggests that the earliest controlled use of fire by hominins was about 1,420,000 years ago. However, it was not until about 7000 BCE that...
- Early humans used fire to keep warm and cook their food. They also learned to use it in hunting and warfare, to kill insects, and to clear forests...
- The most widespread method of producing fire among prehistoric peoples was the friction method. Most commonly, a pointed hardwood was twirled betwe...
- Fire has been an essential element at every stage of the growth of civilization. Much of the history of technology and science might be characteriz...
3 days ago · In which stage of fire does the fire reach a point at which it no longer needs input heat from outside sources to continue burning? Incipient. In which stage of fire is heat released, bringing more fuel to its ignition temperature? Free burning. The fire triangle includes fuel, an oxidizer, and:
3 days ago · A solution is a homogeneous mixture of two or more substances. In a solution, the component present in a smaller proportion is called the solute while the component present in larger proportion is called the solvent. Water is an exception. It is always considered as the solvent regardless of amount.
The number of molecules arriving at an area on one side of the gas layer, with speed at angle from the normal, in time interval is. These molecules made their last collision at a distance above and below the gas layer, and each will contribute a molecular kinetic energy of where is the specific heat capacity.
2 days ago · Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration.
Oct 3, 2024 · combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.
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Oct 3, 2024 · Flame combustion is most prominent with fuels that have been premixed with an oxidant, either oxygen or a compound that provides oxygen, for the reaction. The temperature of flames with this mixture is often several thousand degrees.
