Fuels

Aero-engine fuels are either refined from crude petroleum or obtained from coal, the latter source being that on which Germany has had largely to depend.
Found on http://www.aeroplanemonthly.com/glossary/

fuels

fuels 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 onl...
Found on http://www.wordinfo.info/words/index/info/view_unit/3927/2
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