Densities of (water + nitrogen) in the temperature range 533 K to 703 K and at pressures up to 31 MPa

New measurements of the density of (water + nitrogen)(g) within the temperature range 533 K to 703 K at pressures from 13 MPa to 31 MPa are reported. The measurements have been carried out in a fully automated isochoric apparatus upon 10 mixtures of the two components with mole fractions x of H 2O up to x = 0.6407. The temperature T has been determined with an accuracy of ±0.01 K and the pressure p with an accuracy of ±0.0004· p. It is estimated that the densities ρ reported have an inaccuracy of ±0.0008·ρ for mixtures containing the least water rising to ±0.0013·ρ for those containing the most water.