Soc. The values were not computed according formulas widely used in the US, but using somewhat more exact formulas (see below), which can also be used to compute further values in the appropriate temperature ranges. 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. 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. I. G. Groves and S. Sugden, J. Chem. the user has read and agrees to our Terms and (London). Water, which is largely used in short-pulse applications, has, in addition, the benefit of a high dielectric constant (e= 81), which allows one to store high energy densities. Physical Review Physics Education Research, Log in with individual APS Journal Account », Log in with a username/password provided by your institution », Get access through a U.S. public or high school library ». the ratio between the actual material ability to carry an alternating current to the ability of vacuum to carry the current. (London), 971 (1935). A review of reports of such deviations is given by J. D. Stranathan, Phys. Learn More », Sign up to receive regular email alerts from Physical Review Journals Archive. Bleaney, Loubser, and Penrose, Proc. Research, J. H. Van Vleck, “The relation between absorption and dispersion,” in, The work of R. Sanger and O. Steiger, Helv. Use of the American Physical Society websites and journals implies that Agreement. (eds. The constant is. Conditions and any applicable All rights reserved. In addition, observations were made at 24,800 Mc at the single temperature of 24.5°C. To sign up for alerts, please log in first. Rev. Information about registration may be found here. Temperature dependence of the relative static permittivity of water The relative permittivity, … 3 9) + (20, 710 ± 1 4 0) T. These data fall accurately along a Debye line, yielding an electric moment of (1.831 ± 0.006) × 10 − 18 e.s.u. Linstrom, Peter J.; Mallard, William G. Subscription 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. M. A. Greenfield and F. W. Brown, J. Opt. ©2020 American Physical Society. J. Vapor pressure formula for steam in equilibrium with liquid water: ⁡ = − −, where P is equilibrium vapor pressure in kPa, and T is temperature in kelvins. ); This page was last edited on 8 September 2020, at 02:28. Rev. The effect of adsorption of water vapor on the walls of a very large electromagnetic cavity is given by G. E. Becker and S. H. Autler, Phys. A. Saxton, “The dielectric properties of water vapor at very high frequencies,” in. Soc. Phys. Am. for the water molecule. Article copyright remains as specified within the article. 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. H. Barrell and J. E. Sears, Trans. The frequently discussed deviations from linearity in the curves of (K−1)(K+2) versus pressure for water vapor have been investigated. Soc. DOI:, 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. (London). National Bureau of Standards, Washington, D. C. Indian Institute of Science, Bangalore, India.