Ibisobanuro ahagana hasi ku ipaji

a Mbere yaho, umuhanga mu bya shimi wo muri Suwede witwa Carl Scheele yari yaravumbuye ogisijeni, ariko ananirwa gushyira ahagaragara ibyo yavumbuye. Nyuma yaho, umuhanga mu bya shimi w’Umufaransa witwa Antoine-Laurent Lavoisier ni we wise uwo mwuka ogisijeni.