The dielectric constants of eight gases have been measured by a heterodyne beat frequency method. Special precautions were taken to improve minor defects in the equipment which are believed to have contributed principally to the difference in average values obtained by other observers where these differences were incompatible with the self-consistency of the individuals' data. Data on helium, neon, argon, hydrogen, oxygen, nitrogen, carbon dioxide, and air are given and compared with the results of numerous other observers.

• Received 5 September 1945

DOI:https://doi.org/10.1103/PhysRev.69.101