leachman_2009 ============= J\. W\. Leachman, R\. T Jacobsen, S\. G\. Penoncello and E\. W\. Lemmon, "Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen", J\. Phys\. Chem\. Ref\. Data 38, 721 \(2009\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1063/1\.3160306 `__ **Source kind:** fit **Recorded technique:** Helmholtz\-energy equations of state for parahydrogen, normal hydrogen and orthohydrogen, fitted to thermodynamic data, with ideal\-gas parts fitted to statistical\-mechanics values\. **Materials in structured entries:** None recorded. **Dataset quantities:** None recorded. **Contents:** 0 datasets; 0 formulas. Curation notes -------------- Identity VALIDATED by the library; its text has 145 unmapped glyphs\. No coefficient is transcribed from it\: optmat compares CoolProp's ideal part with the paper's, and takes the constants and the range below\. Pages are pdf pages\. IDEAL GAS AND CONSTANTS \(normal hydrogen\)\: R = 8\.314472 J/\(mol K\) \(p\. 5\); the molar mass is not printed \(CoolProp and Muzny et al\. use 2\.01588 g/mol\)\. The ideal\-gas part \(Eq\. 25, p\. 11; Table 3, p\. 9\) is fitted to the values of Woolley \(1948\), Haar \(1961\), Kosloff \(1974\) and Le Roy \(1990\), with c\_p0 uncertain by below 0\.1 % \(p\. 11\)\. Range 13\.957\-1000 K, 2000 MPa\. AGAINST COOLPROP 8\.0\.0 \(reference key Leachman\-JPCRD\-2009\)\: the same R and ideal part \(computed 2026\-09\-30\)\. **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 :doc:`review register ` for the checks and decisions.