The System now comprises a complex of data centers and other activities, carried on in academic institutions and other laboratories both in and out of government. The independent operational status of existing critical data projects is maintained and encouraged. Data centers that are components of the NSRDS produce compilations of critically evaluated data, critical reviews of the state of quantitative knowledge in specialized areas, and computations of useful functions derived from standard reference data. In addition, the centers and projects establish criteria for evaluation and compilation of data and make recommendations on needed improvements in experimental techniques. They are nornally closely associated with active research in the relevant field. Members of the JANAF Thermochemical Panel (1959)(1960)(1961) and the JANAF Thermochemical Working Group (1961)(1962)(1963)(1964) (1964)(1965)(1966)(1967)(1968)(1969)

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HsSe Carbon subsulfide Carbon selenosulfide Carbon monoxide Carbonyl chloride Carbonyl selenide Carbonyl sulfide Chloropierin Chlorotrifluorometbane Cyanogen Cyanogen bromide Cyanogen chloride Cyanogen fluoride Cyanogen iodide Deuteroeyanio acid Diehlorodifluorornethane Dichlorofluoromcthane Chlorodifluoromethanc T richloroiluororneth ane Cesium Cesium bromide Cesium chloride Cesium fluoride Cesium iodide Chlorine Chlorine fluoride Chlorine trifluoride Chlorine monoxide Chlorine dioxide Dichlorine hex oxide Chlorine heptoxide Chlorosulfonic acid Chromium Chromium carbonyl Chromyl chloride Cobaltous cldoride Cobalt nitrosyl tricarbonyl (' olu in hi urn pen tail uoridc Copper Cuprous bromide Cuprous chloride Cuprous iodide

The enthalpy of formation and absolute entropy of AlH3 at 298.15°K have been measured as −2.73±0.20 kcal/mole and 7.18±0.10 cal/(mole·°K), respectively. The derived Gibbs energy of formation at 298.15°K of 11.11±0.23 kcal/mole indicates AlH3 is unstable with respect to decomposition to the elements.

The vapor pressures of 30 purified samples of organic compounds have been determined by a dynamic boiling point method (3). For 29 compounds, the constants in the Antoine vapor pressure equation were determined from experimental data by a least squares method using an automatic computer.For pentachlorophenol, the constants were determined from a plot of log p, 1 / T (T in °K.). Eight solid state vapor pressures, a heat of fusion of 7000 cal. per mole, and the selected vapor pressures (2) were considered in determining the "best straight line" through three liquid state vapor pressures. The Knudsen effusion technique (I) was used by G. C. Sinke of these laboratories to determine the solid state vapor pressures.The standard deviation, , of the temperature differences is included in Table I.The samples were analyzed by freezing curve techniques (3) except as noted in Table II), and all were better than 99.5 mole % pure, assuming ideal behavior. The freezing point and purity data and the Antoine constants are listed in Table II. Temperatures calculated at selected pressures are in Table III.