cartoon double flask giraffe neck johnpwarren boiling Double Neck Boiling Flask clip art ダブル 首 沸騰 二重首フラスコを沸騰クリップアート
The Hofmann voltameter was one of the earliest voltage measuring devices. Now it is primarily an electrolysis device that separates pure oxygen and pure hydrogen from water. ツール 化学 科学 Hofmann_voltameter