Description: Eukaryota (represented by the Australian green tree frog, left), Bacteria (represented by Staphylococcus aureus, middle) and In biological taxonomy, a domain (also superregnum, superkingdom, empire, or regio) is the highest taxonomic rank of organisms in the three-domain system of taxonomy designed by Carl Woese, an American microbiologist and biophysicist, business empire oil and gas company ||oil and gas company business empire #viral, The Real Story Of The Caribbean Oil Empire | Oil And Gas Pioneers
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A fuel is any material that can be made to react so that it releases chemical or nuclear energy as heat or to be used for work. The concept was originally applied solely to those materials capable of releasing chemical energy but has since also been applied to other sources of heat energy such as nuclear energy (via nuclear fission or nuclear fusion ).
The heat energy released by reactions of fuels is converted into mechanical energy via a heat engine . Other times the heat itself is valued for warmth, cooking, or industrial processes, as well as the illumination that comes with combustion. Fuels are also used in the cells of organisms in a process known as cellular respiration , where organic molecules are oxidized to release usable energy. Hydrocarbons and related oxygen-containing molecules are by far the most common source of fuel used by humans, but
Fuels are contrasted with other substances or devices storing potential energy, such as those that directly release electrical energy (such as batteries and capacitors ) or mechanical energy (such as flywheels , springs, compressed air, or water in a reservoir).