The hypothetical principle of fire, or inflammability, regarded by Stahl as a chemical element.

a hypothetical substance once believed to be present in all combustible materials and to be released during burning

a hypothetical elastic fluid which was seen as a metalizing and combustible principle. Metals were seen as the result of combining calces with phlogiston; smelting expelled the phlogiston. In combustion, phlogiston leaves the combustible body to combine with air or saturate air. The theory of phlogiston is associated with Stahl. [ Cavendish, Priestley, Scheele, Watt et al.

An imaginary element once thought to be given off when objects burned.

A burning substance, usually associated with sulfur.