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 · Catalogue · 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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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#
{
"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 review register for the checks and decisions.