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pneumatic trough

noun, Chemistry.
a trough filled with liquid, especially water, for collecting gases in bell jars or the like by displacement.
Origin of pneumatic trough
First recorded in 1820-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for pneumatic trough

pneumatic trough

(chem) a shallow dishlike vessel filled with a liquid, usually water, and used in collecting gases by displacement of liquid from a filled jar held with its open end under the surface of the liquid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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