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).
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Famous quotes containing the words energy and/or carrier:
“After the planet becomes theirs, many millions of years will have to pass before a beetle particularly loved by God, at the end of its calculations will find written on a sheet of paper in letters of fire that energy is equal to the mass multiplied by the square of the velocity of light. The new kings of the world will live tranquilly for a long time, confining themselves to devouring each other and being parasites among each other on a cottage industry scale.”
—Primo Levi (1919–1987)
“It is the corpse of the bourgeoisie that separates us. With us, it is that class that is the carrier of the chromosome of banality.”
—Jean Baudrillard (b. 1929)