'''Phlogiston''' was a invisible, intangible substance believed to exist in the 1700s, which purported to explain the phenomenon of [[Fire]]. It was widely discarded after the discovery of [[Oxygen]], which fit the observable facts better. | '''Phlogiston''' was a invisible, intangible substance believed to exist in the 1700s, which purported to explain the phenomenon of [[Fire]]. It was widely discarded after the discovery of [[Oxygen]], which fit the observable facts better. |