Sentence Examples


  • McClean, of the stars brighter than magnitude 3.5, only the helium and not the hydrogen stars of Type I.
  • It dissolves readily in strong nitric acid, and the helium contained is thus liberated.
  • Helium is present in the atmosphere, of which it constitutes four parts in a million.
  • The conclusion which was originally drawn from this fact that helium is a mixture of two gases has not been confirmed, as one of the spectra of oxygen is similarly constituted.
  • Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.