乾燥器是一種實驗室玻璃儀器,用於暫時儲存對潮濕敏感的試劑。常見乾燥器形狀是一個帶蓋的玻璃缸,下部有一塑料圓盤隔開的隔層,用於裝填乾燥劑。使用時在缸體和蓋結合處塗上凡士林以保證氣密性。

圖中為一個真空乾燥器 (蓋子頂端的管道用來抽真空),以及右邊較小的乾燥器。下部的隔層中裝填DHMO作為乾燥劑

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