tegeler_1999 ============ Ch\. Tegeler, R\. Span and W\. Wagner, "A New Equation of State for Argon Covering the Fluid Region for Temperatures From the Melting Line to 700 K at Pressures up to 1000 MPa", J\. Phys\. Chem\. Ref\. Data 28, 779 \(1999\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1063/1\.556037 `__ **Source kind:** fit **Recorded technique:** A reference Helmholtz\-energy equation of state for argon from the melting line to 700 K and 1000 MPa, fitted to selected thermodynamic data\. **Materials in structured entries:** None recorded. **Dataset quantities:** None recorded. **Contents:** 0 datasets; 0 formulas. Curation notes -------------- Identity VALIDATED\_WITH\_WARNINGS by the library\. Pages are pdf pages\. IDEAL GAS AND CONSTANTS\: M = 39\.948\(1\) g/mol and R = 8\.31451 J/\(mol K\) \(p\. 5\); the ideal\-gas part is the monatomic gas's, c\_p0 = \(5/2\) R \(Eq\. 4\.5, p\. 26\), electronic excitation contributing 0\.01 % only at 10000 K\. Range 83\.8058\-700 K, 1000 MPa \(p\. 31\)\. AGAINST COOLPROP 8\.0\.0 \(reference key Tegeler\-JPCRD\-1999\)\: the same M, R and ideal part \(computed 2026\-09\-30\)\. The equation's own R is 5\.7e\-6 from CODATA's \(TC\-758\)\. **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 -------- 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.