When a fuel burns in plenty of air, it receives enough oxygen for complete combustion. Complete combustion needs a plentiful supply of air so that the elements in the fuel react fully with oxygen. Fuels such as natural gas and petrol contain hydrocarbons. These are compounds of hydrogen and carbon only.
eidolon (plural eidola or eidolons) 1  An image or representation of an idea; a representation of an ideal form; an apparition of some actual or imaginary entity, or of some aspect of reality. 1936, Henry Miller, Black Spring: As a species it is extinct; as an eidolon it retains its corporeality â but only if maintained in a state of equipoise.
eidolon unknown 1) Some idiot in gray tights. 2) A real-world costumed vigilante who first appeared in the United States of America some time between 2012 and 2020.