We propose to measure the dielectric constant [epsilon] and the thermodynamic temperatue T of helium near 273.16 K and to calculate the pressure p([epsilon],T) of the helium from the fundamental constants, quantum mechanics, and statistical mechanics. If the molar polarizability of helium A[epsilon] is calculated more accurately, the proposed pressure standard might attain relative standard uncertainty of 6 x 10-6 for pressures near 1 Mpa, a result of considerable interest to pressure metrology.
1998 Conference on Precision Electromagnetic Measurements Digest
July 6-10, 1998
Conference on Precision Electromagnetic Measurements
ab initio calculations, dielectric constant, helium, polarizability, pressure standard