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Kundt tube

[koo nt] /kʊnt/
noun, Physics.
a gas-filled tube used to measure the speed of sound: when a membrane at one end is vibrated at a frequency that produces standing waves, a layer of powder forms lumps at the nodes.
named after August Kundt (1839-94), German physicist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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