Precise electromagnetic measurements of the polarizability (dielectricity, refractivity) of a macroscopic sample of helium gas are re-examined in view of recently published ab initio calculations of the helium atomic polarizability, including relativistic effects. The collation yields a new estimate of the Boltzmann constant as well as a general assessment of the reliability of optical and electrical measurements of the polarization properties of helium gas.
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Leslie Pendrill (1996) studied this question.
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