a graduated glass tube used for the analysis and measurement of volumes of gases during chemical reactions
eudiometric /-ʹmetrik/ adj
eudiometrically /-ʹmetrikli/ adv
Italian eudiometro, from Greek eudia fair weather (from eu- + -dia weather) + Italian -metro -meter, from Greek metron measure. The term was orig applied to an instrument used to measure oxygen, thought to be present in greater amounts in fair weather