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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/29085

    Título
    Updated determination of the molar gas constant R by acoustic measurements in argon at UVa-CEM.
    Autor
    Segovia Puras, José JuanAutoridad UVA Orcid
    Lozano Martín, DanielAutoridad UVA Orcid
    Martín González, María del CarmenAutoridad UVA Orcid
    Chamorro Camazón, César RubénAutoridad UVA Orcid
    Villamañán Olfos, Miguel ÁngelAutoridad UVA
    Pérez, Eduardo
    García Izquierdo, Carmen
    Campo, Dolores del
    Año del Documento
    2017
    Editorial
    IOP PUBLISHING
    Descripción
    Producción Científica
    Documento Fuente
    Metrologia 54 (2017) 663-673
    Abstract
    A new determination of the molar gas constant was performed from measurements of the speed of sound in argon at the triple point of water and extrapolation to zero pressure. A new resonant cavity was used. This is a triaxial ellipsoid whose walls are gold-coated steel and which is divided into two identical halves that are bolted and sealed with an O-ring. Microwave and electroacoustic traducers are located in the northern and southern parts of the cavity, respectively, so that measurements of microwave and acoustic frequencies are carried out in the same experiment. Measurements were taken at pressures from 600 kPa to 60 kPa and at 273.16 K. The internal equivalent radius of the cavity was accurately determined by microwave measurements and the first four radial symmetric acoustic modes were simultaneously measured and used to calculate the speed of sound. The improvements made using the new cavity have reduced by half the main contributions to the uncertainty due to the radius determination using microwave measurements which amounts to 4.7 parts in 106 and the acoustic measurements, 4.4 parts in 106, where the main contribution (3.7 parts in 106) is the relative excess half-widths associated with the limit of our acoustic model, compared with our previous measurements. As a result of all the improvements with the new cavity and the measurements performed, we determined the molar gas constant R = (8.314449  0.000056) J·K-1·mol-1 which corresponds to a relative standard uncertainty of 6.7 parts in 106. The value reported in this paper lies -1.3 parts in 106 below the recommended value of CODATA 2014, although still within the range consistent with it.
    Materias (normalizadas)
    Termodinámica
    Palabras Clave
    Molar gas constant
    Triaxial ellipsoid resonator
    Kelvin
    Microwave resonance
    Speed of sound
    Acoustic resonance
    ISSN
    1681-7575
    Revisión por pares
    SI
    DOI
    10.1088/1681-7575/aa7c47
    Patrocinador
    MEC ENE2013-47812-R
    Junta de Castilla y León VA035U16
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/29085
    Derechos
    openAccess
    Collections
    • BioEcoUVa - Artículos de revista [195]
    • DEP46 - Artículos de revista [100]
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    Universidad de Valladolid

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