出典:Wiktionary
pneumatic trough (複数形 pneumatic troughs)
出典:Wikipedia
出典:『Wikipedia』 (2010/07/26 16:54 UTC 版)
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.