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Text File  |  1992-09-02  |  311b  |  9 lines

  1. Emission of light by a liquid that is
  2. subjected to high-frequency sound waves. The
  3. rapid changes of pressure induced by the
  4. sound cause minute bubbles to form in the
  5. liquid, which then collapse. Light is emitted
  6. at the final stage of the collapse, probably
  7. because it squeezes and heats gas inside the
  8. bubbles.
  9.