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Meaning of Kundt tube

Kundt' tube"

Pronunciation: (koont), [key]
— Physics. Physics.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.