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- Vapor pressure formulation for ice
- Clausius-Clapeyron equation; saturation vapor pressure over ice; thermal properties of ice; vapor pressure; vapor pressure at the triple point; vapor pressure of ice; water vapor
- A new formulation is presented for the vapor pressure of ice from Ihe triple point to - 100C based on thermodynamic calculations. Use is made of Ihe definitive experimental value of the vapor pressure of water at its triple point recently obtained...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure equation for water in the range 0 to 100 C
- Clausius-Clapeyron equation; saturation vapor pressure over water; vapor pressure; vapor pressure of water; water vapor; steam; virial coefficients
- Some precise measurements of the vapor pressure of liquid water at seven temperatures in the range 25 to 100 C were reported recently by H. F. Stimson of NBS. These measurements have an estimated standard deviation of 20 ppm or less, except at 25 C...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure and heat of sublimation of tungsten
- The vapor pressure of tungsten was measured by the Langmuir method in the temperature range 2574 to 3183 °K using a vaccum microbalance. The least-squares line through the data, logP(atm) = 7.790 - 44680/T, yields a second law ?H°s(2850 °K) = 204.4...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure and heat of sublimation of tungsten
- Heat of sublimation; Langmuir vaporization; rate of vaporization; tungsten; vapor pressure
- The vapor pressure of tungsten was measured by the Langmuir method in the temperature range 2600 to 3100 K using a vacuum microbalance. Four series of data gave concordant results and three of the four series gave second and third law heats of...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure and heat of sublimation of rhenium
- Heat of sublimation; Langmuir vaporization; rate of vaporization; rhenium; vapor pressure
- The vapor pressure of rhenium was measured by the Langmuir method in the temperature range 2350-3050 K using a vacuum microbalance. The least squares line through the four series of data points is 4.5756 log P(atm) = 32.26 - 180700/T. Least squares...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure and heat of sublimation of platinum
- Heat of sublimation; Langmuir vaporization; platinum; rate of vaporization; vapor pressure
- The vapor pressure of platinum was measured by the Langmuir method in the temperature range 1700-2000 K using a vacuum microbalance. Eight series of data gave concordant results and an average third-law heat of sublimation of 564.49 kJ mol-1 with...
- Journal of Research of NIST and Predecessor Publications
- Vapor pressure and fixed points of oxygen and heat capacity in the critical region
- Journal of Research of NIST and Predecessor Publications
- Van Ness Street through the NBS Washington, DC campus
- Photographs; History; Metrology
- Van Ness Street, looking west from Connecticut Ave, through the NBS Washington, DC campus. This image is part of the Buildings on Old Campus collection.
- NBS-NIST Campuses, Buildings, and Labs
- Value of the high-pressure steam test of portland cement.
- Journal of Research of NIST and Predecessor Publications
- Validity of the cosine-fourth-power law of illumination
- Journal of Research of NIST and Predecessor Publications
- Validation of new instrumentation for isotope dilution mass spectrometric determination of organic serum analytes
- definitive methods; isotope dilution mass spectrometry; measurement
- A major activity in the 20 year collaboration between the Analytical Chemistry Division at NIST and the College of American Pathologists (CAP) has been the development of highly accurate and precise "definitive" methods for important clinical...
- Journal of Research of NIST and Predecessor Publications
- Valence-only correlation in LiH and BeH+
- BeH+; correlation energy; dissociation energy; LiH; molecular orbital; potential energy curve
- The pseudonatural orbital procedure has been applied to the calculation of the potential energy curve of LiH and the dissociation energy of BeH+. Only the two-electron bonding pair is correlated and estimates of s and p type correlation are...
- Journal of Research of NIST and Predecessor Publications
- Valence resonance states of N-2
- Electron scattering resonance; excited states N2; excited states N-; inelastic scatter; N-2; valence excited states
- Resonance valence excited states of N-2 are calculated and used to interpret resonant excitation of the A and B states of N2 by electron impact.
- Journal of Research of NIST and Predecessor Publications
- Vacuum-tube acceleration pickup
- Journal of Research of NIST and Predecessor Publications
- Vacuum Tubes and Electron Devices
- Dr. Marsden first arranged these tubes to ease identification and they were then given arbitrary numbers 1 through 64, with several sets of tubes. In total they comprise more than 64 vacuum tubes or electron devices. Dr. Marsden joined the...
- NIST Museum Artifacts
- Vacuum Tube Voltmeter
- Vacuum tube voltmeter type 726A manufactured by the General Radio Company (Cambridge, MA). Serial Number 212.
- NIST Museum Artifacts
- Vacuum technology considerations for mass metrology
- kilogram; mass; vacuum
- Vacuum weighing of mass artifacts eliminates the necessity of air buoyancy correction and its contribution to the measurement uncertainty. Vacuum weighing is also an important process in the experiments currently underway for the redefinition of...
- Journal of Research of NIST and Predecessor Publications
- Vacuum processing technique for development of primary standard blackbodies
- blackbody sources; fixed-point blackbodies; ITS-90; radiance temperature; rf furnace
- Blackbody sources with nearly unity emittance that are in equilibrium with a pure freezing metal such as gold, silver, or copper are used as primary standard sources in the International Temperature Scale of 1990 (ITS-90). Recently, a facility...
- Journal of Research of NIST and Predecessor Publications
- Vacuum Flasks of Unusual Design
- NBS-NIST Technical Series Publications
- Vacuum Capacitor Guard Ring
- Galvanometer; Radiometry; Electric currents
- This capacitor was constructed around 1930 and used until about 1938. It was designed to provide a uniform field between the guarded or measuring electrode and the unguarded electrode. The unguarded electrode rests on the bottom of the case on...
- NIST Museum Artifacts

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