Volume 13, Issue 1, January 1984
Index of content:
13(1984); http://dx.doi.org/10.1063/1.555709View Description Hide Description
Experimental measurements of the osmotic and activity coefficients, the enthalpy, and the heat capacity were used to derive a semiempirical equation for the thermodynamic properties of NaCl(aq) at constant pressure. This equation may be combined with results contained in the previous paper on the volumetric properties to yield a complete equation of state valid in the region 273 K≤T≤573 K, saturation pressure ≤P≤1 kbar, 0≤m≤6.0 mol kg− 1. It is shown that this equation may be extrapolated to higher solute molalities at lower pressures. An estimation of uncertainties in various quantities is given. Tables of values for various thermodynamic properties are presented in the appendix.
13(1984); http://dx.doi.org/10.1063/1.555705View Description Hide Description
Refractive index data of ZnS, ZnSe, and ZnTe were searched, compiled, and analyzed. Recommended values of refractive index for the transparent spectral region were generated in the ranges 0.5–14 μm and 93–1000 K for ZnS, 0.55–18 μm and 93–618 K for ZnSe, and 0.55–30 μm at room temperature for ZnTe. Generation of these values was based on a dispersion equation that best fits selected data sets covering wide temperature and wavelength ranges where the available experimental data permit. Temperature and wavelength derivatives of refractive index were calculated from the first derivatives of the equation with respect to temperature and wavelength, respectively. The results are in concordance with the existing data.
13(1984); http://dx.doi.org/10.1063/1.555706View Description Hide Description
In order to assess the high temperature vaporization behavior and equilibrium gas phase compositions of binary alkali metal oxides, the relevant thermodynamic and molecular constant data have been compiled and critically evaluated. Selected values of the Gibbs energy and enthalpy functions of condensed and vapor phases are given in the form of equations valid over wide temperature ranges, along with the standard entropies and enthalpies of formation. These data were used to generate plots of the equilibrium partial pressures of vapor species as functions of temperature for representative conditions ranging from reducing to oxidizing. Maximum vaporization rates have been calculated using the Hertz–Knudsen equation. Literature references are given.
13(1984); http://dx.doi.org/10.1063/1.555707View Description Hide Description
In view of the important role that water substance plays in science and industry, this paper lists the thermophysical properties of fluid H2O which are most needed for engineering applications. The properties are described in a very compact form with the aid of explicit expressions for programing on a computer and for inclusion in data banks. The paper includes a fundamental equation in the form of the Helmholtz free energy expressed as an analytic function of temperature and density. This fundamental equation is a dimensionless version of the Provisional IAPS Formulation 1982 for the Thermodynamic Properties of Ordinary Water Substance for Scientific and General Use, which enables one to calculate all equilibrium thermodynamic properties in a wide range of states, but with the exclusion of a small region near the critical point. In the latter region, the equilibrium properties are described by a scaled fundamental equation in the form of the pressure as a function of chemical potential and temperature. In addition, the paper gives equations for the viscosity,thermal conductivity, and surface tension. All equations in the paper are mutually thermodynamically consistent. The set of equations and their constants listed here represents the most reliable information according to the judgment of the authors.
13(1984); http://dx.doi.org/10.1063/1.555708View Description Hide Description
The International Association for the Properties of Steam adopted in 1982 a new formulation for the thermodynamic properties of water substance for scientific and general use. In this paper, we present an assessment of currently available methods for calculating the viscosity of water substance when used in conjunction with the new formulation for the equilibrium properties.
13(1984); http://dx.doi.org/10.1063/1.555702View Description Hide Description
After a critical summary of previous wavelength measurements and rotational line assignments of the Schumann–Runge absorption bands of O2, the results of the present study performed at high resolution with a 6.65 m vacuum spectrograph are given. These include (a) an atlas of the Schumann–Runge absorption bands of O2 at 300 K showing detailed rotational line assignments in the wavelength region 175–205 nm containing the bands (v′,0) with v′=0–21 and (v′,1) with v′=2–16; (b) tables of wave numbers measured for rotationally assigned principal branch lines belonging to the bands (v′,0) with v′=0–17 and (v′,1) with v′=2–17; (c) a table of measured wave numbers of lines in the region near the dissociation limit where many unassigned lines exist; (d) a table of wave numbers calculated for satellite and forbidden lines belonging to the bands (9,0)–(17,0) together with the few values obtained from our measurements; and (e) a table of term values for the upper state B 3Σ− u vibration–rotation levels with v′=9–17 calculated from measurements of the principal branch lines of the (9,0)–(17,0) bands and the known ground state term values.
13(1984); http://dx.doi.org/10.1063/1.555703View Description Hide Description
The report contains a set of easy‐to‐program expressions for the calculation of the thermodynamic and transport properties of the five noble gases (He, Ne, Ar, Kr, Xe) and of the 26 binary and multicomponent mixtures that can be formed with them. The properties in question are second virial coefficient B, viscosity η, thermal conductivity λ, self‐diffusion and binary diffusion coefficient D, and thermal diffusion factor αT. The calculation of properties is restricted to low densities ( ρ≪B/C) but covers the full range of compositions and a temperature interval extending from absolute zero to the onset of ionization. Owing to the careful theoretical basis on which the algorithm has been erected, all properties are thermodynamically consistent with each other. Reference to a selected set of critically evaluated measurements provides a basis for the estimation of uncertainties. The report contains 54 abbreviated tables of numerical data and 86 deviation plots. It is asserted that the results are comparable to the best measurements that could be performed at present.