stewart_1991

R. B. Stewart, R. T Jacobsen and W. Wagner, “Thermodynamic Properties of Oxygen from the Triple Point to 300 K with Pressures to 80 MPa”, J. Phys. Chem. Ref. Data 20, 917 (1991)

Source record · Catalogue · Review register

DOI: 10.1063/1.555897

Source kind: fit

Recorded technique: Tables of the thermodynamic properties of oxygen from Schmidt and Wagner’s fundamental equation, with its ideal-gas part, ancillary equations and comparisons with the data, from the freezing line to 300 K at pressures to 80 MPa.

Materials in structured entries: O2

Dataset quantities: None recorded.

Contents: 0 datasets; 1 formula.

Curation notes

Identity VALIDATED_WITH_WARNINGS by the library. Pages cited are pdf pages.

IDEAL GAS (section 4, pdf p. 11): R = 8.31434 J/(mol K), M = 31.9988 g/mol (pdf p. 4). Eq. (11), Wagner, Ewers and Schmidt’s equation, is the one Schmidt and Wagner (1985) use: c_p0/R = N1 T^-1.5 + N2 + N3 T^2 + N4 u^2 e^u/(e^u - 1)^2 + N5 (2/3) eta^2 e^-eta/[1 + (2/3) e^-eta]^2, u = N6/T, eta = N7/T, with N1..N7 = 1.06778, 3.50042, 0.166961e-7, 1.01258, 0.944365, 2242.45, 11580.4. It was fitted to Baehr et al.’s values (30-1100 K) and Gurvich et al.’s (100-3000 K), which it meets within 0.003 J/(mol K). Eq. (12), Stewart and Jacobsen’s earlier equation, is given as an alternative for 70-1100 K (0.002 J/(mol K)).

AGAINST COOLPROP 8.0.0 (reference key Schmidt-FPE-1985, Stewart-JPCRD-1991, computed 2026-09-30): CoolProp’s ideal part is a refit of Eq. (11). The two agree to 3.3e-6 from 60 K to 1500 K, then part: -1.6e-5 at 1600 K, -4.9e-5 (-0.0018 J/(mol K)) at 1700 K, -1.1e-4 at 1800 K and -3.5e-4 (-0.013 J/(mol K)) at 2000 K, beyond Eq. (11)’s 0.003 J/(mol K) from 1800 K. optmat’s O2 heat capacity therefore stops at 1700 K (TC-765). Against Eq. (12) CoolProp differs by up to 1.5e-4 at 60-1000 K.

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

stewart_1991/eq11

{
  "id": "eq11",
  "material": "O2",
  "equation": "Eq. (11), pdf p. 11",
  "printed": "c_p0/R = N1 T^-1.5 + N2 + N3 T^2 + N4 u^2 e^u/(e^u - 1)^2 + N5 (2/3) eta^2 e^-eta/[1 + (2/3) e^-eta]^2",
  "variable": "u = N6/T, eta = N7/T, T in K",
  "range": "30-3000 K (its fit)",
  "coefficients": {
    "N1": "1.06778",
    "N2": "3.50042",
    "N3": "0.166961e-7",
    "N4": "1.01258",
    "N5": "0.944365",
    "N6": "2242.45",
    "N7": "11580.4"
  },
  "check": "CoolProp 8.0.0's refit agrees to 3.3e-6 from 60 K to 1500 K (tests/test_transport.py)."
}

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.