setzmann_1991
=============

U\. Setzmann and W\. Wagner, "A New Equation of State and Tables of Thermodynamic Properties for Methane Covering the Range from the Melting Line to 625 K at Pressures up to 1000 MPa", J\. Phys\. Chem\. Ref\. Data 20, 1061 \(1991\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/setzmann_1991.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1063/1\.555898 <https://doi.org/10.1063/1.555898>`__

**Source kind:** fit

**Recorded technique:** A reference Helmholtz\-energy equation of state for methane from the melting line to 625 K and 1000 MPa, fitted to selected thermodynamic data, with tables\.

**Materials in structured entries:** None recorded.

**Dataset quantities:** None recorded.

**Contents:** 0 datasets; 0 formulas.

Curation notes
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Identity VALIDATED\_WITH\_WARNINGS by the library\. Printed pp\. 1061\-1155; pages cited are pdf pages\.

IDEAL GAS AND CONSTANTS\: M = 16\.0428\(13\) g/mol and R = 8\.31451\(21\) J/\(mol K\) \(p\. 5, printed 1064\); the ideal\-gas part \(Eq\. 3\.8, p\. 27; Table 27\) is fitted to McDowell and Kruse's \(1963\) values, \+\-0\.015 %\. T\_c = 190\.564 K\. Range 90\.6941\-625 K, 1000 MPa\.

AGAINST COOLPROP 8\.0\.0 \(reference key Setzmann\-JPCRD\-1991\)\: the same M, R and ideal part \(computed 2026\-09\-30\)\.

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

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No datasets are recorded.

Formulas
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No formulas are recorded.

Corrections
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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 </register>` for the checks and decisions.