Sentence Examples


  • HELIUM (from Gr.
  • Helium is relatively abundant in many minerals, all of which are radioactive, and contain uranium or thorium as important constituents.
  • (For the significance of this fact see Radioactivity.) The richest known source is thorianite, which consists mainly of thorium oxide, and contains 9.5 cc. of helium per gram.
  • Strutt has suggested that helium in hot springs may be derived from the disintegration of common rocks at great depths.
  • Helium is present in the atmosphere, of which it constitutes four parts in a million.

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