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Measurement and correlation of the (pressure, density, temperature) relation of nitrogen in the temperature range from 273.15 to 323.15 K at pressures up to 8 MPa

1988; Elsevier BV; Volume: 20; Issue: 9 Linguagem: Inglês

10.1016/0021-9614(88)90113-9

1096-3626

W Duschek, Reiner Kleinrahm, Wolfgang Wagner, M. Jaeschke,

Scientific Measurement and Uncertainty Evaluation

Comprehensive (p, ϱ, T) measurements on pure nitrogen were carried out in the temperature range from 273.15 to 323.15 K at pressures up to 8 MPa. The precision of the density is better than ± 0.01 per cent or ± 0.001 kg·m−3, whichever is greater. Comparisons with experimental results of previous workers are presented. A truncated virial equation with four adjusted parameters has been established for the gas range investigated which represents the density of nitrogen with an uncertainty of less than ±0.01 per cent. The density under standard conditions (273.15 K, 0.101325 MPa) was calculated from this equation as ϱs = (1.25039±0.00007) kg·m−3. The second and third virial coefficients were determined with an uncertainty of less than 0.17 cm3·mol−1 or 75 (cm3 · mol−1)2, respectively. The truncated virial equation is compared with two current equations of state for nitrogen and with two equations of state for the determination of the compression factor of natural gas; the deviations are less than 0.03 per cent.