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- 저자 : Plimmer, M D (검색결과 1 건)
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Determination of the molar mass of argon from high-precision acoustic comparisons
Feng, X J,Zhang, J T,Moldover, M R,Yang, I,Plimmer, M D,Lin, H BUREAU INTERNATIONAL DES POIDS ET MESURES 2017 METROLOGIA -BERLIN- Vol.54 No.3
<P>This article describes the accurate determination of the molar mass <I>M</I> of a sample of argon gas used for the determination of the Boltzmann constant. The method of one of the authors (Moldover <I>et al</I> 1988 <I>J. Res. Natl. Bur. Stand</I>. <B>93</B> 85–144) uses the ratio of the square speed of sound in the gas under analysis and in a reference sample of known molar mass. A sample of argon that was isotopically-enriched in <SUP>40</SUP>Ar was used as the reference, whose unreactive impurities had been independently measured. The results for three gas samples are in good agreement with determinations by gravimetric mass spectrometry; (〈<I>M</I> <SUB>acoustic</SUB>/<I>M</I> <SUB>mass-spec</SUB>〉 − 1) = (−0.31 ± 0.69) × 10<SUP>−6</SUP>, where the indicated uncertainty is one standard deviation that does not account for the uncertainties from the acoustic and mass-spectroscopy references.</P>
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