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Chemistry

Thermochemical properties

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Displaying 201 - 225 of 780

Time dependence in static measurements of vapor pressure

November 17, 2015
Author(s)
Robert F. Berg
The static method for measuring vapor pressure assumes that the sample is pure and that its temperature is steady and uniform. In practice, the measured pressure may be time dependent due to evaporative cooling after pumping on the sample, transpiration of

Test of a virtual cylindrical acoustic resonator for determining the Boltzmann constant

August 19, 2015
Author(s)
XiaoJuan Feng, Hong Lin, Keith A. Gillis, Michael R. Moldover, Jintao Zhang
We report progress in determining the Boltzmann constant k B using a virtual acoustic resonator derived by combining the measured frequencies of the longitudinal acoustic modes of two argon-filled, cylindrical, cavity resonators in such a way as to

Representation and Validation of Liquid Densities for Pure Compounds and Mixtures

August 7, 2015
Author(s)
Vladimir Diky, John P. O'Connell, Jens Abildskov, Kenneth G. Kroenlein, Michael D. Frenkel
Reliable correlation and prediction of liquid densities are important for designing chemical processes at normal and elevated pressures. We have extended a corresponding states model from molecular theory to yield a robust method for quality testing of

The IAPWS Industrial Formulation for the Thermodynamic Properties of Seawater

July 29, 2015
Author(s)
Allan H. Harvey, H J. Kretzschmar, Rainer Feistel, Wolfgang Wagner, Kiyoshi Miyagawa, J R. Cooper, Michael Hiegemann, Francisco L. Blangetti, Konstantin A. Orlov, I Weber, Anurag Singh, Sebastian Herrmann
In 2008, the International Association for the Properties of Water and Steam (IAPWS) adopted a standard formulation for the thermodynamic properties of seawater as a sum of contributions to the Gibbs free energy from pure water and from dissolved sea salt

Gas Chromatographic Retention Indices

June 9, 2015
Author(s)
Thomas J. Bruno
The interpretation of results from chromatographic measurements can often be augmented with an appropriate mathematical treatment of the solute retention that is observed. The goal of treatment is to make the resulting metric as independent of the

Measuring collected gas with microwave and acoustic resonances

April 23, 2015
Author(s)
Keith A. Gillis, James W. Schmidt, Michael R. Moldover, James B. Mehl
With calibrations of large flow meters in mind, we established the feasibility of determining the mass M of argon gas contained within a 0.3 m 3 commercially manufactured pressure vessel ("tank") with a relative standard uncertainty of u r(M) = 0.0016 at 0

Speed of sound measurements and a fundamental equation of state for cyclopentane

April 22, 2015
Author(s)
Eric W. Lemmon, Holger Gedanitz, Maria J. Davila
The speed of sound in liquid cyclopentane has been measured in the temperature range from (258 to 353) K at pressures up to 30 MPa (42 data points) using a pulse-echo method with a double path type sensor. The expanded overall uncertainty (k = 2) in the

Data Formats for Elementary Gas Phase Kinetics: Part 3. Reaction Classification

April 20, 2015
Author(s)
Donald R. Burgess Jr., Jeffrey A. Manion, Carrigan J. Hayes
A method denoted InChI ER has been developed to describe and identify elementary reactions in a standard computer-readable notation by extending the IUPAC International Chemical Identifier (InChI) formalism. Five additional hierarchical InChI ER layers
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