kestin_1981 =========== J\. Kestin, Ö\. Korfali, J\. V\. Sengers and B\. Kamgar\-Parsi, "Density dependence and composition dependence of the viscosity of neon\-helium and neon\-argon mixtures", Physica A 106, 415 \(1981\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1016/0378\-4371\(81\)90121\-7 `__ **Source kind:** measurement **Recorded technique:** A viscosity study \(oscillating\-disk viscometer at 25 °C\) of He\-Ne and Ne\-Ar mixtures, which also measured the density of two Ne\-Ar mixtures against pressure \(pp\. 417\-419\)\. Mixtures prepared gravimetrically, the mole fractions known 'to about four significant figures' \(p\. 417\); purities 99\.995 % He, 99\.997 % Ne, 99\.998 % Ar\. Pressure by a dead\-weight gauge, 'about 0\.0003 MPa at pressures up to 3 MPa and 0\.003 MPa at pressures beyond 3 MPa' \(p\. 418\)\. Density by weighing the charge of a mixture cylinder of known volume at the viscometer's pressure, the volume calibrated against pressure with pure argon and neon of known density \(Michels' equations of state\); the room kept close to 25 °C \(pp\. 418\-419\)\. **Materials in structured entries:** Ar, He **Dataset quantities:** excess\_second\_virial\_coefficient, mixture\_compressibility\_factor, mixture\_density, mixture\_second\_virial\_coefficient **Contents:** 11 datasets; 0 formulas. Curation notes -------------- Identity VALIDATED\_WITH\_WARNINGS by the library \(Crossref fields\)\. Printed pp\. 415\-442 \(pdf pages 1\-28; printed page = pdf page \+ 414\)\. Mainly a viscosity paper; only its equation\-of\-state data are recorded here\. TABLE III \(p\. 421; Experimental pressures and densities for two Ne\-Ar mixtures at 25 °C; image checked against every extracted cell, 2026\-10\-01, all agree\)\: x\_Ar = 0\.2727 \(10 rows, 0\.43\-16\.40 MPa\) and 0\.7722 \(11 rows, 0\.70\-13\.70 MPa\), each row P \(MPa\), rho x 10^3 \(mol/cm^3\), Z\_exp = PV/RT and \(Z\_exp \- Z\_calc\) x 10^3\. Extracted\: the density \(mixture\_density, primary\) and Z\_exp \(mixture\_compressibility\_factor, check\) against pressure, all rows \(the table stops at 16\.4 MPa, 162 atm, just above the 150 atm used for other sources; the whole table is kept\)\. Z\_exp is computed from the same P and rho, rounded to three decimals\: it is a check on the density, never fitted beside it\. CHECKED\: Z\_exp = P / \(rho R T\), R = 8\.31441 J/\(mol K\), T = 298\.15 K, reproduces every printed Z\_exp within its rounding except the first row of x\_Ar = 0\.7722 \(P = 0\.7032 MPa, rho = 0\.3522e\-3 mol/cm^3\), which gives 0\.805 against the printed 1\.000\. The printed Z\_exp = 1\.000 and residual \+1e\-3 are consistent with the pressure and the paper's equation of state \(rho = 0\.2837e\-3 mol/cm^3 would give both\), not with the printed density, and a density of 0\.3522e\-3 at that pressure would leave a residual of \-0\.19 that the fit would not have hidden\. One of the two printed numbers is wrong; which cannot be shown from the paper, so no erratum\: the row is excluded from both datasets of that mixture\. Refitting the paper's Eqs\. \(2\)\-\(6\) to the other 20 rows \(Z from P and rho; B\_ii and C\_iii of Table IIA; E the only free parameter\) gives E\_Ne\-Ar = 12\.99 cm^3/mol against the printed 12\.95 \(p\. 420\), which reproduces it within the rounding of Table IIA's pure\-gas coefficients\. The printed residual column is not reproduced\: recomputed from the printed Z\_exp with Table IIA's B and C the residuals have an rms of 1\.0e\-3, the printed ones 2\.3e\-3, and the two differ by up to 3e\-3 \(rms 2\.4e\-3\)\. Left in the printed cells, not used\. TABLES IIA and IIB \(p\. 419\)\: B \(cm^3/mol\) and C \(\(cm^3/mol\)^2\) of Ne\-Ar \(x\_Ar\) and He\-Ne \(x\_Ne\) mixtures at 25 °C\. The pure\-gas rows are the authors' refits of Eq\. \(2\) to the isotherms of Michels and coworkers for helium, neon and argon \(0\-160 atm, their refs\. 12, 13 and 15\); the mixture rows are computed from them by Eqs\. \(3\)\-\(6\) with the excess second virial coefficient E = B\_12 \- \(B\_11 \+ B\_22\)/2\: 12\.95 cm^3/mol for Ne\-Ar \(this work, from Table III\) and 0\.76 cm^3/mol for He\-Ne \(Brewer and Vaughn, J\. Chem\. Phys\. 50, 2960 \(1969\), the paper's ref\. 16; not in the library\)\. Checked \(2026\-10\-01\)\: the mixture B are reproduced from the pure rows and those E to 0\.01 cm^3/mol \(Ne\-Ar 9\.16, 3\.00, \-4\.99 for the printed \-4\.98; He\-Ne 11\.93, 11\.99, 11\.76\), and the C within 1 \(cm^3/mol\)^2 by the geometric\-mean rule \(6\)\. Extracted\: the mixture B \(mixture\_second\_virial\_coefficient\), as checks, since they are model values \(the He\-Ne ones rest on Brewer and Vaughn's E\)\. Not extracted\: the pure\-gas rows \(refits of Michels' data, which optmat would take from the originals\) and C \(no quantity in the vocabulary\)\. He\-Ne is filed under helium \(He sorts before Ne\) with helium's mole fraction, 1 \- x\_Ne\: 0\.8021, 0\.5965 and 0\.2172 for the printed x\_Ne 0\.1979, 0\.4035 and 0\.7828\. E\_Ne\-Ar = 12\.95 cm^3/mol at 25 °C \(p\. 420, text\)\: the excess second virial coefficient fitted to Table III, entered inline\. The paper compares it with Brewer and Vaughn's 13\.00 cm^3/mol; that value, and E\_He\-Ne = 0\.76 cm^3/mol, are Brewer and Vaughn's and are not recorded here \(to be curated from the original\)\. NOT EXTRACTED\: the viscosities \(Tables IV\-VI\) and the viscosity expansions \(Tables VII\-IX\)\. The densities printed beside the viscosities are, for neon, the He\-Ne mixtures and the first 20 points of x\_Ar = 0\.5467, computed from the measured pressure and the equation of state above \(p\. 426\); for the other Ne\-Ar points they are measured, but Table VI prints no pressure, so they are not pressure\-density data\. UNCERTAINTY\: the densities 'with an accuracy of about 0\.1%' \(p\. 419\), level not stated; the pressure as above; the composition to about four significant figures\. The temperature is 25 °C as the caption states; the room was kept 'close to 25 °C' \(p\. 418\) and the viscometer temperatures of Table VI lie within 0\.25 K of it \(24\.77 to 25\.23 °C\)\. **Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- kestin\_1981/rho\_xAr\_0\.2727 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "rho_xAr_0.2727", "material": "Ar", "file": "Ar/kestin_1981__rho_xAr_0.2727.csv", "table": "tbl_68ea087a83f3", "quantity": "mixture_density", "unit": "mol/cm3", "scale": 0.001, "abscissa": "pressure", "abscissa_unit": "MPa", "use": "primary", "parameters": { "partner": "Ne", "mole_fraction": 0.2727, "temperature_k": 298.15 }, "uncertainty": { "relative": 0.001, "level": "not stated" } } Table III \(p\. 421\)\: the measured molar density of the Ne\-Ar mixture x\_Ar = 0\.2727 at 25 °C against pressure, 0\.43\-16\.40 MPa\. kestin\_1981/rho\_xAr\_0\.7722 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "rho_xAr_0.7722", "material": "Ar", "file": "Ar/kestin_1981__rho_xAr_0.7722.csv", "table": "tbl_68ea087a83f3", "quantity": "mixture_density", "unit": "mol/cm3", "scale": 0.001, "abscissa": "pressure", "abscissa_unit": "MPa", "use": "primary", "excluded_rows": { "0.7032": "P and rho are inconsistent with the printed Z_exp (P / rho R T = 0.805, printed 1.000) and residual; one of them is misprinted, which cannot be shown (record notes)" }, "parameters": { "partner": "Ne", "mole_fraction": 0.7722, "temperature_k": 298.15 }, "uncertainty": { "relative": 0.001, "level": "not stated" } } Table III \(p\. 421\)\: the measured molar density of the Ne\-Ar mixture x\_Ar = 0\.7722 at 25 °C against pressure, 1\.58\-13\.70 MPa \(the 0\.70 MPa row excluded\)\. kestin\_1981/Z\_xAr\_0\.2727 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "Z_xAr_0.2727", "material": "Ar", "file": "Ar/kestin_1981__Z_xAr_0.2727.csv", "table": "tbl_68ea087a83f3", "quantity": "mixture_compressibility_factor", "abscissa": "pressure", "abscissa_unit": "MPa", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.2727, "temperature_k": 298.15 }, "uncertainty": { "relative": 0.001, "level": "not stated" } } Table III \(p\. 421\)\: Z\_exp = PV/RT of x\_Ar = 0\.2727 at 25 °C, computed by the authors from the same P and rho as rho\_xAr\_0\.2727 and printed to three decimals; a check, never fitted beside the density\. kestin\_1981/Z\_xAr\_0\.7722 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "Z_xAr_0.7722", "material": "Ar", "file": "Ar/kestin_1981__Z_xAr_0.7722.csv", "table": "tbl_68ea087a83f3", "quantity": "mixture_compressibility_factor", "abscissa": "pressure", "abscissa_unit": "MPa", "use": "check", "excluded_rows": { "0.7032": "P and rho are inconsistent with the printed Z_exp (P / rho R T = 0.805, printed 1.000) and residual; one of them is misprinted, which cannot be shown (record notes)" }, "parameters": { "partner": "Ne", "mole_fraction": 0.7722, "temperature_k": 298.15 }, "uncertainty": { "relative": 0.001, "level": "not stated" } } Table III \(p\. 421\)\: Z\_exp = PV/RT of x\_Ar = 0\.7722 at 25 °C, computed by the authors from the same P and rho as rho\_xAr\_0\.7722 and printed to three decimals; a check, never fitted beside the density\. kestin\_1981/E\_Ne ~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "E_Ne", "material": "Ar", "table": "text", "quantity": "excess_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "primary", "parameters": { "partner": "Ne" } } 1 inline points in the source record. p\. 420\: E\_Ne\-Ar = B\_12 \- \(B\_Ar \+ B\_Ne\)/2 = 12\.95 cm^3/mol at 25 °C, the one free parameter of Eqs\. \(2\)\-\(6\) fitted to Table III \(Z from the measured P and rho\) with the pure\-gas B and C of Table IIA\. Refitted here to 12\.99 \(record notes\)\. No uncertainty stated\. kestin\_1981/B\_xAr\_0\.2727 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "B_xAr_0.2727", "material": "Ar", "file": "Ar/kestin_1981__B_xAr_0.2727.csv", "table": "tbl_b62f6e4e3136", "quantity": "mixture_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.2727 } } Table IIA \(p\. 419\)\: B of the Ne\-Ar mixture x\_Ar = 0\.2727 at 25 °C, computed by Eq\. \(3\) from the refitted pure\-gas B and E\_Ne\-Ar = 12\.95 cm^3/mol \(record notes\); a model value, not a measurement\. kestin\_1981/B\_xAr\_0\.5467 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "B_xAr_0.5467", "material": "Ar", "file": "Ar/kestin_1981__B_xAr_0.5467.csv", "table": "tbl_b62f6e4e3136", "quantity": "mixture_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.5467 } } Table IIA \(p\. 419\)\: B of the Ne\-Ar mixture x\_Ar = 0\.5467 at 25 °C, computed by Eq\. \(3\) from the refitted pure\-gas B and E\_Ne\-Ar = 12\.95 cm^3/mol \(record notes\); a model value, not a measurement\. kestin\_1981/B\_xAr\_0\.7722 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "B_xAr_0.7722", "material": "Ar", "file": "Ar/kestin_1981__B_xAr_0.7722.csv", "table": "tbl_b62f6e4e3136", "quantity": "mixture_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.7722 } } Table IIA \(p\. 419\)\: B of the Ne\-Ar mixture x\_Ar = 0\.7722 at 25 °C, computed by Eq\. \(3\) from the refitted pure\-gas B and E\_Ne\-Ar = 12\.95 cm^3/mol \(record notes\); a model value, not a measurement\. kestin\_1981/B\_xHe\_0\.8021 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "B_xHe_0.8021", "material": "He", "file": "He/kestin_1981__B_xHe_0.8021.csv", "table": "tbl_6a5c1d106b1d", "quantity": "mixture_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.8021 } } Table IIB \(p\. 419\)\: B of the He\-Ne mixture x\_Ne = 0\.1979 \(x\_He = 0\.8021\) at 25 °C, computed by Eq\. \(3\) from the refitted pure\-gas B and Brewer and Vaughn's E\_He\-Ne = 0\.76 cm^3/mol \(record notes\); a model value, not a measurement\. kestin\_1981/B\_xHe\_0\.5965 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "B_xHe_0.5965", "material": "He", "file": "He/kestin_1981__B_xHe_0.5965.csv", "table": "tbl_6a5c1d106b1d", "quantity": "mixture_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.5965 } } Table IIB \(p\. 419\)\: B of the He\-Ne mixture x\_Ne = 0\.4035 \(x\_He = 0\.5965\) at 25 °C, computed by Eq\. \(3\) from the refitted pure\-gas B and Brewer and Vaughn's E\_He\-Ne = 0\.76 cm^3/mol \(record notes\); a model value, not a measurement\. kestin\_1981/B\_xHe\_0\.2172 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: text { "id": "B_xHe_0.2172", "material": "He", "file": "He/kestin_1981__B_xHe_0.2172.csv", "table": "tbl_6a5c1d106b1d", "quantity": "mixture_second_virial_coefficient", "unit": "cm3/mol", "abscissa": "temperature", "abscissa_unit": "C", "use": "check", "parameters": { "partner": "Ne", "mole_fraction": 0.2172 } } Table IIB \(p\. 419\)\: B of the He\-Ne mixture x\_Ne = 0\.7828 \(x\_He = 0\.2172\) at 25 °C, computed by Eq\. \(3\) from the refitted pure\-gas B and Brewer and Vaughn's E\_He\-Ne = 0\.76 cm^3/mol \(record notes\); a model value, not a measurement\. 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.