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Kundt tube

[koo nt]
noun 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.
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Origin of Kundt tube

named after August Kundt (1839–94), German physicist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018