Realization of the pascal based on argon using a Fabry-Perot refractometer

Based on a recent experimental determination of the static polarizability and a first-principle calculation of the frequency-dependent dipole polarizability of argon, this work presents, by using a Fabry-Perot refractometer operated at 1550 nm, a realization of the SI unit of pressure, the pascal, for pressures up to 100 kPa, with an uncertainty of [(1.0 mPa)² + (5.8 × 10^-6P)² + (26 × 10^-12P²)²]^1/2. The work also presents a value of the molar polarizability of N₂ at 1550 nm and 302.9146 K of 4.396572(26) × 10^-6 m³/mol, which agrees well with previously determined ones.