fuel +

All materials that are capable of releasing energy when their chemical or physical structures are altered.

Fuels release their energies either through chemical means; such as, burning, or by nuclear means; such as, nuclear fission or nuclear fusion.

An important property of useful fuels is that their energies can be stored to be released only when needed, and that the releases are controlled in such a way that the energies can be harnessed to produce various kinds of work.

1. To provide with additional fuel, as of aircraft, ships, and cars which are refilled.
2. to take on a fresh supply of fuel.
3. To provide additional material for or to give a renewed impetus for someone to do something.

1. Synthetic fuel which is a liquid fuel synthesized from a nonpetroleum source; such as, coal, oil shale, or waste plastics.
2. Fuel that is artificially made as contrasted to that which is found in nature.

Synthetic gas made from coal is considered to be more economical and easier to produce than synthetic oil.

When natural gas supplies in the earth are being depleted, it is expected that synthetic gas will be able to be used widely as a substitute fuel for a petroleum product.

Not provided with fuel.