(Latin: producing energy; primarily by burning)
2. Gas such as methane or liquid fuel such as ethanol (ethyl alcohol) made from organic waste material, usually by microbial action.
3. A renewable fuel, e.g., biodiesel, biogas, and methane, that is derived from biological matter.
Oil, natural gas, and coal are examples of fossil fuels.
2. Specifically, a material which can be used to provide power for an engine, combustor, power plant, nuclear reactor, etc.
3. Something consumed to produce energy.
4. A material such as wood, coal, gas, or oil burned to produce heat or power.
5. To provide with a combustible substance that provides energy.
6. Fissionable material used in a nuclear reactor.
7. Nutritive material metabolized by a living organism; food.
8. Something that maintains or stimulates an activity or an emotion: "His behavior was fueled by money."
9. Etymology: from Old French fouaille, fuaille, "bundle of firewood"; from Late Latin focalia, plural of focalis, "pertaining to the hearth"; from Latin focus, "hearth"(burning place, fire place).
Fuel cells differ from conventional electrical cells in that the active materials; such as, hydrogen and oxygen, are not contained within the cell, but are supplied from outside.
Here is a related article about Fuel Cells: The Future Source of Fuel Operations?
A general statement of this is based on the average mileage traveled per unit of fuel for a class of vehicles; for example, a certain car type in a given model year.
Fuel economy is most often measured by the distance a vehicle can travel with a given volume of fuel. In the U.S., fuel economy is measured in vehicle miles per gallon of fuel. In the European Union, liters per 100 kilometers is the preferred measure.
Not necessarily equivalent to fuel economy, in that one vehicle might have better technology and therefore be more efficient than another, but if it is much larger and heavier than the other vehicle, it would have poorer fuel economy.
2. A hybrid fuel cell vehicle also derives drive motor power from a supplemental battery or ultracapacitor.
2. Fed with combustible material.
2. Providing a substance such as oil or gas which is used to provide heat or power, usually by going through the process of burning.