According to ISO 13600, an energy carrier is either a substance (energy form) or a phenomenon (energy system) that can be used to produce mechanical work or heat or to operate chemical or physical processes.
In the field of Energetics, however, an energy carrier corresponds only to an energy form (not an energy system) of energy input required by the various sectors of society to perform their functions.
Examples of energy carriers include liquid fuel in a furnace, gasoline in a pump, electricity in a factory or a house, and hydrogen in a tank of a car.
Note that coal, oil and natural gas are primary energy sources which are extracted from the earth (fossil fuels). Natural uranium is also a primary energy source extracted from the earth but does not come from the decomposition of organisms (mineral fuel).
Read more about Energy Carrier: Definition According To ISO 13600, Definition Within The Field of Energetics, Related Topics
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