©2020 American Physical Society. Phys. Soc. I. G. Groves and S. Sugden, J. Chem. (eds. Website © 2020 AIP Publishing LLC. The saturated vapor pressure over water in the temperature range of −100 °C to −50 °C is only extrapolated [Translator's note: The values have various units (Pa, hPa or bar), which must be considered when reading them. Conditions and any applicable Soc. The dielectric constant of water vapor was determined at 9280 Mc by a cavity comparison method at 10 temperatures ranging from 32 to 103°C. Acta. If you need an account, please register here. The constant is. (London). Roy. An example of the effect of strong absorption lines on, This can be seen by examining the data of Osborne, Stimson, and Ginnings, NBS J. M. A. Greenfield and F. W. Brown, J. Opt. In addition, observations were made at 24,800 Mc at the single temperature of 24.5°C. Birnbaum, Kryder, and Lyons, J. Appl. Subscription Precautions for dielectric constants of powders Powder and flake substances. Am. (London). for the water molecule. Phys. For T = 333 K to 423 K: A = 7.0917; B = 1668.21; C = 45.1. All rights reserved. Hence they apply only to pure phases and need a correction factor for systems in which air is present. Chem. for the water molecule. the user has read and agrees to our Terms and Linstrom, Peter J.; Mallard, William G. Soc. (London), 971 (1935). Temperature dependence of the relative static permittivity of water The relative permittivity, … K) at 0 °C. The values apply only to smooth interfaces and in the absence other gases or gas mixtures such as air. Bleaney, Loubser, and Penrose, Proc. ); This page was last edited on 8 September 2020, at 02:28. For further discussion of these matters see C. T. Zahn, Phys. Rev. For T = 273 K to 333 K: A = 7.2326; B = 1750.286; C = 38.1. Rev. This option allows users to search by Publication, Volume and Page. DOI:https://doi.org/10.1103/PhysRev.48.538, To celebrate 50 years of enduring discoveries, APS is offering 50% off APCs for any manuscript submitted in 2020, published in any of its hybrid journals: PRL, PRA, PRB, PRC, PRD, PRE, PRApplied, PRFluids, and PRMaterials. Soc. The Dielectric Constant, or permittivity - ε - is a dimensionless constant that indicates how easy a material can be polarized by imposition of an electric field on an insulating material. Article copyright remains as specified within the article. J. Physical Review™, Physical Review Letters™, Physical Review X™, Reviews of Modern Physics™, Physical Review A™, Physical Review B™, Physical Review C™, Physical Review D™, Physical Review E™, Physical Review Applied™, Physical Review Fluids™, Physical Review Accelerators and Beams™, Physical Review Physics Education Research™, APS Physics logo, and Physics logo are trademarks of the American Physical Society. A review of reports of such deviations is given by J. D. Stranathan, Phys. E. C. Hurdis and C. P. Smyth, J. It has been shown: (1) That with proper location of the insulators of the vapor condenser in weak fields, the dielectric constant curves for the vapor are linear until saturation is approached closely; they are linear over the entire range of pressures at which breaks have previously been reported; (2) that neither pronounced breaks similar to those reported by several workers, nor the small residual deviations always present near saturation are due to the conductivity effect as commonly supposed; (3) that these breaks are due wholly to the added polarization contributed by the film of water molecules adsorbed on the insulator surfaces. ISSN 1536-6065 (online). H. Barrell and J. E. Sears, Trans. Accurate dielectric data have been obtained for water vapor at 14 temperatures ranging from 21.3°C to 197.9°C; they can be represented by the equation [(K−1)(K+2)]RTp′=(4.03±0.39)+(20,710±140)T. These data fall accurately along a Debye line, yielding an electric moment of (1.831 ± 0.006) × 10−18 e.s.u. To sign up for alerts, please log in first.

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