phlogiston theory
英[flɔˈdʒistən ˈθiəri]美[floˈdʒɪsˌtɑn ˈθiəri]
The phlogiston theory is an obsolete scientific theory that postulated a fire-like element called phlogiston, contained within combustible bodies, that is released during combustion. The name comes from the Ancient Greek [phlogistón (burning up), from φλ?ξ] phlóx (flame).