noun🔗ShareフロギストンThe hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning."Chemists once believed that wood released phlogiston into the air as it burned. "かつて化学者たちは、木が燃えるときにフロギストンを空中に放出すると信じていた。theorychemistrysubstancephysicsscienceenergyChat with AIVocabulary GamePractice Reading
