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Text File  |  1992-09-02  |  549b  |  15 lines
  1. D2O, deuterium oxide, water containing the
  2. isotope deuterium instead of hydrogen
  3. (relative molecular mass 20 as opposed to 18
  4. for ordinary water). Its chemical properties
  5. are identical with those of ordinary water,
  6. while its physical properties differ
  7. slightly. It occurs in ordinary water in the
  8. ratio of about one part by weight of
  9. deuterium to 5,000 parts by weight of
  10. hydrogen and can be concentrated by
  11. electrolysis, the ordinary water being more
  12. readily decomposed by this means than the
  13. heavy water. It has been used in the nuclear
  14. industry.
  15.