harvey_2023

A. H. Harvey, E. W. Lemmon, D. O. Ortiz Vega, K. R. Hall and J. C. Holste, “An Equation of State for the Thermodynamic Properties of Helium”, NIST Interagency Report 8474 (2023)

Source record · Catalogue · Review register

DOI: 10.6028/nist.ir.8474

Source kind: fit

Recorded technique: A Helmholtz-energy equation of state for helium-4, 2.1768-1500 K and pressures to 2000 MPa, fitted to measured and ab initio thermodynamic data. It stands here for the equation CoolProp names OrtizVega-JPCRD-2019, which is not in hand.

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

Identity VALIDATED by the library. Pages are the report’s pdf pages.

IDEAL GAS AND CONSTANTS (Table 1, p. 8; Eq. 3, p. 9): M = 4.002602 g/mol and R = 8.314472 J/(mol K), which ‘should be used’ with the equation; the ideal-gas part is the monatomic gas’s, c_p0 = (5/2) R. Range 2.1768-1500 K, 2000 MPa (p. 21).

AGAINST COOLPROP 8.0.0 (reference key OrtizVega-JPCRD-2019, computed 2026-09-30): the same M and c_p0 = (5/2) R with R = 8.3144598 J/(mol K), 1.47e-6 below the report’s. The report is taken here as the published form of CoolProp’s equation: CoolProp’s own bibliography lists that one as unpublished (D. O. Ortiz-Vega, K. R. Hall, J. C. Holste, V. D. Arp, A. H. Harvey and E. W. Lemmon, ‘Equation of state for Helium-4’, 2019). Only the ideal part and M are used from it, where the two agree. optmat’s c_p0 is (5/2) R with CODATA’s R (optmat.gas.transport).

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

Datasets

No datasets are recorded.

Formulas

No formulas are recorded.

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.