摘要:

A survey of the published values of heat capacity and enthalpy obtained from calorimetric measurements on the crystal, glass, and liquid phases of the first few members of homologous series expressed as polynomial functions of temperature were fit to selected data by a least squares procedure. Tables of smoothed values of thermodynamic proper

ISSN:0047-2689    

DOI:10.1063/1.555747

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

The chemical thermodynamic properties of alkylbenzene isomer groups from C8H10to C9H12in the ideal gas phase have been calculated from 298.15 to 1000 K from tables of Stull, Westrum, and Sinke. In the absence of literature data on all isomers of higher isomer groups, the properties of isomers of C10H14to C12H18have been calculated using Benson group values. For isomer group properties, increments per carbon atom have been calculated to show the extent to which thermodynamic properties of higher isomer groups may be obtained by linear extrapolation. Equilibrium mole fractions within isomer groups have been calculated for the ideal gas state from 298.15 to 1000 K. Values ofC○P,S○, &Dgr;fH○, and &Dgr;fG○are given for all species from C6H6to C12H18in joules for a standard state pressure of 1 bar.

ISSN:0047-2689    

DOI:10.1063/1.555745

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

Recommendations for the most likely values of the critical parameters of light and heavy water as accepted by the International Association for the Properties of Steam are presented, together with an assessment of their reliability. The results are, for H2O:Tc=(647.14+&dgr;1)K, &dgr;1=0.00±0.10;Pc=(22.064+0.27&dgr;1±0.005) MPa; &rgr;c=(322±3) kg/m3; and for D2O:Tc=(643.89+&dgr;2) K, &dgr;2=0.00±0.20;Pc=(21.671+0.27 &dgr;2±0.010) MPa; &rgr;c=(356±5) kg/m3. Supporting material for these choices of values and the assessment of their reliability is provided. Temperature values are on the International Practical Temperature Scale of 1968 (IPTS 1968) unless otherwise indicated.

ISSN:0047-2689    

DOI:10.1063/1.555746

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

The paper presents a concise and accurate representation of the viscosity of nitrogen, oxygen, and their binary mixtures at the limit of zero density and in the temperature range 110–2100 K, which can be programed easily on a computer. The correlation is founded upon the semiclassical kinetic theory of polyatomic gases and a body of critically evaluated experimental data. Use is also made of the principle of corresponding states to extend the correlation outside of the temperature range for which direct experimental results exist. The optimum correlation has an associated uncertainty of ±0.3% around room temperature, but it rises to a maximum of ±2% at either extreme of the temperature range. A secondary representation of the viscosity of the same gases, providing some saving in computational effort and a further extension of the temperature range at the expense of a small loss of accuracy, is also presented. The relationship of this second representation to similar correlations for other gases makes it attractive for some purposes.

ISSN:0047-2689    

DOI:10.1063/1.555748

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

Based on available experimental data, the thermal conductivity of fluid air has been critically evaluated. A new set of recommended values is presented covering a pressure range from 1 to 1000 bar and a temperature range from 70 to 1000 K. Using the concept of residual thermal conductivity the recommended values are described by a 13‐parameter equation of state in terms of temperature and density which may be applied up to a density of 900 kg/m3. From comparisons of all data sources, the uncertainty of the recommended values was estimated to be below ±4%. Additional experiments are needed, especially in the subcritical region of liquid air.

ISSN:0047-2689    

DOI:10.1063/1.555749

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

Beginning in the 1930s, G.H. Dieke and his students carried out an extensive program of measuring the optical spectrum of molecular hydrogen and its isotopes. Parts of the work were published but the project was interrupted by Dieke’s death in 1965, with much of the latest and most accurate work unpublished. This paper gives the 27 488 lines of molecular deuterium, measured by Dieke, arranges the 8243 assigned lines into band systems, and derives rotational–vibrational energy levels for over 50 electronic states. It also derives energy levels from published vacuum ultraviolet spectra of D2.

ISSN:0047-2689    

DOI:10.1063/1.555750

出版商:AIP    

年代:1985

数据来源: AIP