a 8. Appendix TABLE A-1. Experimental results on heat capacity and electrical resistivity of tantalum-1 a TABLE A-2. Experimental results on heat capacity TABLE A-4. Experimental results on normal spectro and electrical resistivity of tantalum-2 emittance of tantalum at λ = 650 nm 9. References [1] Cezairliyan, A., Morse, M. S., Berman, H. A., and Beckett, C. W., High-speed (subsecond) measurement of heat capacity, electrical resistivity, and thermal radiation properties of molybdenum in the range 1900 to 2800 K. J. Res. Nat. Bur. Stand. (U.S.), 74A (Phys. and Chem.), No. 1, 65-92 (Jan.Feb. 1970). [2] Cezairliyan, A., High-speed methods of measuring specific heat of electrical conductors at high temperatures, High Temp.-High Pres., 1, 517 (1969). [3] Cezairliyan, A., McClure, J. L., Morse, M. S., and Beckett, C. W., Measurement of Heat Capacity of Tantalum in the Range 1900 to 3000 K by a Pulse Heating Method. Fifth Symposium on Thermophysical Properties (Boston), ASME, New York (1970). [4] Lowenthal, G. C., The specific heat of metals between 1200 K and 2400 K, Australian J. Phys. 16, 47 (1963). [5] Rasor, N. S., and McClelland, J. D., Thermal properties of graphite, molybdenum, and tantalum to their destruction temperatures, J. Phys. Chem. Solids 15, 17 (1960). [6] Taylor, R. E., and Finch, R. A., The specific heats and resistivities of molybdenum, tantalum, and rhenium, J. LessCommon Metals 6, 283 (1964). [7] Jaeger, F. M., and Veenstra, W. A., The exact measurement of the specific heats of solid substances at high temperatures (vanadium, niobium, tantalum, and molybdenum), Rec. Trav. Chim. 53, 677 (1934). [8] Hoch, M., and Johnston, H. L., A high-temperature drop calorimeter, The heat capacities of tantalum and tungsten between 1000 and 3000 K, J. Chem. Phys. 65, 855 (1961). [9] Schultz, H., “Quenching of Vacancies in Tungsten,” in Lattice Defects in Quenched Metals, R. M. J. Cotterill, M. Doyama, J. J. Jackson and M. Meshi, Eds. (Academic Press, New York, 1965), p. 761. [10] Meakin, J. D., Lawley, A., and Koo, R. C., "Vacancy Loops in Quenched Molybdenum," in Lattice Defects in Quenched Metals, R. M. J. Cotterill, M. Doyama, J. J. Jackson, and M. Meshi, Eds. (Academic Press, New York, 1965), p.767. [11] Hultgren, R., Orr, R. L., Anderson, P. D., and Kelley, K. K., Selected Values of Thermodynamic Properties of Metals and Alloys (John Wiley, New York, 1963). [12] Foley, G. M., High-speed optical pyrometer, Rev. Sci. Instr. 41, 827 (1970). [13] DeVos, J. C., Evaluation of the quality of a blackbody, Physica 20, 669 (1954). [14] International Practical Temperature Scale of 1968, Metrologia 5, 35 (1969). [15] Compt. Rend. of the 21st Conference of the International Union of Pure and Applied Chemistry, Montreal (1961), Report of the Committee on Atomic Weights, p. 284. [16] Tietz, T. E., and Wilson, J. 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[23] Petrov, V. A., Chekhovskoi, V. Ya., and Sheindlin, A. E., Integral hemispherical radiating power and specific electrical resistance of tantalum in the temperature interval 12002800 K. High Temperature 6, 525 (1968). [24] Allen, R. D., Glasier, L. F., and Jordan, P. L., Spectral emissivity, total emissivity, and thermal conductivity of molybdenum, tantalum, and tungsten above 2300 K, J. Appl. Phys. 31, 1382 (1960). [25] White, G. K., and Woods, S. B., Electrical and thermal resistivity of the transition elements at low temperatures, Phil. Trans. Royal Soc. (London) 251, 273 (1959). [27] [28] [26] Tye, R. P., Preliminary measurements on the thermal and electrical conductivities of molybdenum, niobium, tantalum, and tungsten, J. Less-Common Metals 3, 13 (1961). Powell, R. W., Thermal conductivity: A review of some important developments, Contemp. Phys. 10, 579 (1969). Gshneidner, K. A., "Physical Properties and Interrelationships of Metallic and Semimetallic Elements," in Solid State Physics, Vol. 16, F. Seitz and D. Turnbull, Eds. (Academic Press, New York, 1965), p. 275. (Paper 75A1-644) JOURNAL OF RESEARCH of the National Bureau of Standards-A. Physics and Chemistry Thermophysical Properties of Methane: Orthobaric Robert D. Goodwin** Institute for Basic Standards, National Bureau of Standards, Boulder, Colorado 80302 (June 30, 1970) For use in the computation of thermodynamic functions, analytical descriptions are given for the following properties: the orthobaric densities and saturation temperatures; the heats of vaporization: the specific heats of saturated liquid; and the thermodynamic functions for ideal gas states. Key words: Heats of vaporization; methane; orthobaric densities; specific heats of the saturated liquid; The current need for thermodynamic properties of methane was described in our preceding report [1].' The present report concludes our selection of published properties data for coexisting vapor and liquid, and includes also a description of the ideal gas thermofunctions. All of these properties are placed in analyti cal form directly useful for thermal computations. Temperatures are on the IPTS (1968), as in [1], and we use the same fixed-point constants: T, = 90.66 K, P=0.1151 atm, (0.01166MN/m2), d1 = 28.0536 mol/l (liquid); and T = 190.53 K, Pe=45.346 atm, (4.5947 MN/m2), de 10.15 mol/l. = 2. The Orthobaric Densities For the densities of coexisting vapor and liquid methane the preponderance of published data is on the liquid phase [2, 3, 4, 5, 6, 7, 8]. For the vapor phase, therefore, we have estimated data at densities Figures in brackets indicate the literature references at the end of this paper. |