cartoon double flask giraffe neck johnpwarren boiling Double Neck Boiling Flask clip art 双 颈部 沸腾 双颈沸腾烧瓶剪贴画
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. 工具 化学 科学 Hofmann_voltameter