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A pneumatic trough is a piece of laboratory apparatus used for collecting gases, such as hydrogen, oxygen, and nitrogen. Pneumatic troughs require a liquid such as water. Scientists also have used mercury in pneumatic troughs, but usually only for the collection of water-soluble gases. Health-and-safety issues surrounding mercury generally prohibit its use in modern-day pneumatic troughs. Four items are required for gas collection with a pneumatic trough: * The trough itself, which is a large glass dish or a similar container * A gas bottle (or bulb), to hold the gas collected * A way to support the gas bottle or bulb, such as a Beehive shelf or a hanger (see picture) * A liquid in the trough The bottle is filled with water, inverted, and placed into the pneumatic trough already containing water. The outlet tube from the gas-generating apparatus is inserted into the opening of the bottle so that gas can bubble up through it, displacing the water within. ==See also== *Beehive shelf *Pneumatic chemistry *Joseph Priestley *Stephen Hales 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pneumatic trough」の詳細全文を読む スポンサード リンク
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